0:00:00.880,0:00:05.805 At this point I think you know a little bit about what multiplication is. 0:00:05.805,0:00:09.025 Or "multi"-plication. 0:00:09.025,0:00:13.315 What we're going to do in this video is to give you just a ton of more practice, 0:00:13.315,0:00:17.706 and start you on your memorization of the multiplication tables. 0:00:17.706,0:00:20.009 And if you watch enough Khan Academy videos, 0:00:20.009,0:00:21.279 and hopefully you will in the future, 0:00:21.279,0:00:24.540 you'll realize that I'm normally not a big fan of memorization. 0:00:24.550,0:00:26.385 But the one thing about multiplication 0:00:26.385,0:00:31.220 is if you memorize your multiplication tables that we'll start to do in this video, 0:00:31.220,0:00:33.850 it'll pay huge benefits the rest of your life. 0:00:33.850,0:00:36.724 So I promise you, do it now, you'll never forget it, 0:00:36.724,0:00:39.547 and the rest of your life everything will be-- 0:00:39.547,0:00:41.517 well, I don't want to make false promises to you, 0:00:41.517,0:00:45.790 but they'll be better than if you didn't memorize your multiplication tables. 0:00:45.790,0:00:47.290 So what are the multiplication tables? 0:00:47.290,0:00:49.745 Well that's all of the different numbers 0:00:49.745,0:00:50.850 times each other. 0:00:50.850,0:00:53.590 So let's actually do a little bit of review. 0:00:53.600,0:00:58.900 So if I say, what is two times one? 0:00:58.900,0:01:02.270 That is equal to two plus itself one time. 0:01:02.280,0:01:05.010 So this is equal to just two. 0:01:05.010,0:01:07.060 That's two plus itself one time. 0:01:07.060,0:01:08.059 I don't have to say plus anything 0:01:08.059,0:01:09.430 because there's only one two there. 0:01:09.430,0:01:13.460 I could also write this as one plus itself two times. 0:01:13.460,0:01:15.390 So that's also one plus one. 0:01:15.400,0:01:17.580 Well that also equals two. 0:01:17.590,0:01:18.210 Fair enough. 0:01:18.210,0:01:19.901 So two times one is two. 0:01:19.901,0:01:22.722 And if you watched the last video, what's two times zero? 0:01:22.722,0:01:23.516 Well that's zero. 0:01:23.516,0:01:26.660 So you don't have to memorize your zero multiplication tables 0:01:26.670,0:01:30.560 because everything times zero is zero, or zero times anything is zero. 0:01:30.560,0:01:31.090 So let's see. 0:01:31.090,0:01:33.682 What's two times two? 0:01:33.682,0:01:35.988 Two times two. 0:01:35.988,0:01:37.254 Well, this is equal to-- 0:01:37.254,0:01:39.460 we're going to add two to itself two times. 0:01:39.460,0:01:41.830 So that's two plus two. 0:01:41.840,0:01:42.770 And there's only a way to do that. 0:01:42.780,0:01:45.480 I could say take this two and add it to itself two times, 0:01:45.480,0:01:46.680 but it's the same thing. 0:01:46.680,0:01:47.610 And what's two plus two? 0:01:47.620,0:01:49.450 That's equal to four. 0:01:49.450,0:01:51.400 What's two times three? 0:01:51.400,0:01:57.900 Two times three is equal to two plus two plus two. 0:01:57.900,0:02:03.355 It can also be equal to three plus three. 0:02:03.355,0:02:04.905 We learned in a previous video 0:02:04.920,0:02:07.498 this statement can be written either of these ways. 0:02:07.498,0:02:09.380 And in either case, what's it equal to? 0:02:09.397,0:02:10.282 Well three plus three 0:02:10.282,0:02:12.028 is the same thing as two plus two plus two, 0:02:12.028,0:02:14.774 and that's equal to six. 0:02:14.774,0:02:15.812 All right. 0:02:15.812,0:02:18.138 Now what is two times four? 0:02:18.153,0:02:20.686 Two times four. 0:02:20.686,0:02:26.065 Well that's equal to two plus two plus two plus two. 0:02:26.065,0:02:29.870 And notice, it's exactly what two times three was. 0:02:29.870,0:02:32.610 Two times three was that. 0:02:32.620,0:02:36.490 I have that here, but now I'm just adding another two to it. 0:02:36.490,0:02:39.740 So if we're too lazy to sit here and add two plus two is four. 0:02:39.740,0:02:40.710 Four plus two is six. 0:02:40.710,0:02:41.802 Instead of doing that, we could say, 0:02:41.802,0:02:45.680 hey look, we already know that this thing over here, this was six. 0:02:45.680,0:02:48.300 We figured it out in the previous line right there. 0:02:48.310,0:02:51.550 We figured out this is six, so we could just say, oh, two times four 0:02:51.560,0:02:55.610 is going to be two more than that, which is equal to eight. 0:02:55.610,0:02:57.480 And you should hopefully see that pattern. 0:02:57.490,0:03:01.907 As we go from two times one, to two times two, 0:03:01.907,0:03:03.760 to two times three, what's happening? 0:03:03.770,0:03:05.500 How much are we going up by? 0:03:05.500,0:03:08.120 From two to four we're going plus two. 0:03:08.120,0:03:11.300 From four to six we're going plus two. 0:03:11.310,0:03:13.340 And then from six to eight we're going plus two. 0:03:13.340,0:03:15.685 So you could figure out what two times five is, 0:03:15.685,0:03:16.950 even without doing the addition. 0:03:16.960,0:03:23.430 Two times five is equal to two plus two plus two plus two plus two. 0:03:23.430,0:03:26.070 It could also be written as five plus five. 0:03:26.080,0:03:29.110 Two times four could've been written as four plus four as well. 0:03:29.120,0:03:30.490 And what's that equal to? 0:03:30.500,0:03:33.090 We could add all of these up or we could add these two up. 0:03:33.090,0:03:36.285 Or we could just say it's going to be two more than two times four. 0:03:36.285,0:03:38.564 So it's going to be ten. 0:03:38.564,0:03:41.780 I'll finish the two times tables. 0:03:41.780,0:03:45.280 And I think you see all of the patterns that emerge from it. 0:03:45.280,0:03:47.710 So two times six. 0:03:47.710,0:03:51.580 That's going to be two plus itself six times. 0:03:51.595,0:03:55.369 Let's see. One, two, three, four, five, six, 0:03:55.369,0:03:58.690 which should also be equal to six plus itself two times. 0:03:58.690,0:04:00.620 This could be interpreted either way. 0:04:00.620,0:04:02.980 And that's going to be equal to twelve. 0:04:02.990,0:04:06.898 Once again, two more than two times five 0:04:06.898,0:04:09.710 because we're adding two to itself one more time. 0:04:09.710,0:04:12.290 So it's going to be two more. 0:04:12.300,0:04:13.880 Let's keep going. 0:04:13.880,0:04:16.540 So two times seven. 0:04:16.550,0:04:20.148 Two times seven is equal to-- 0:04:20.163,0:04:24.104 well, I could write two plus two plus two plus two-- 0:04:24.104,0:04:27.230 this is getting tiring-- plus two plus two. 0:04:27.240,0:04:27.800 Is that seven? 0:04:27.810,0:04:31.200 One, two, three, four, five, six, seven. 0:04:31.200,0:04:33.849 And that's the same thing as seven plus seven, 0:04:33.849,0:04:37.370 which you may or may not know is equal to fourteen. 0:04:37.370,0:04:39.550 You could just say hey, that's going to be two more than twelve. 0:04:39.560,0:04:43.630 So twelve plus one plus two is-- twelve plus one is thirteen. 0:04:43.630,0:04:45.530 Twelve plus two is fourteen. 0:04:45.540,0:04:47.580 All right, let's just keep going. 0:04:47.580,0:04:50.740 Two times eight. 0:04:50.750,0:04:53.810 I could do all of this business here where I add the twos 0:04:53.810,0:04:56.660 or I could say, look, it's just going to be two more than two times seven. 0:04:56.670,0:04:59.528 So I could say it's going to be fourteen plus two. 0:04:59.528,0:05:00.470 I'm just adding two to that one. 0:05:00.480,0:05:01.822 So I could say it's sixteen. 0:05:01.822,0:05:05.610 Or I could also say that's eight plus eight. 0:05:05.620,0:05:06.800 That's also sixteen. 0:05:06.810,0:05:08.174 I could have done all the twos out, 0:05:08.174,0:05:15.040 but if you like you could do that for your own benefit and learning. 0:05:15.040,0:05:17.848 We're almost-- well, we could go forever 0:05:17.848,0:05:19.360 because there is no largest number. 0:05:19.370,0:05:21.510 I can keep going. 0:05:21.510,0:05:24.970 Two times nine times ten times one hundred times one thousand times one million. 0:05:24.980,0:05:26.642 But I'm going to stop at twelve 0:05:26.642,0:05:28.760 because that tends to be what people need to memorize. 0:05:28.770,0:05:32.330 But if you really want to be a "mathelete" 0:05:32.330,0:05:34.260 you want to go up to twenty. 0:05:34.260,0:05:36.790 But let's go to two times nine. 0:05:36.790,0:05:38.810 That's going to be two more than two times eight. 0:05:38.810,0:05:40.990 It's going to be eighteen. 0:05:40.990,0:05:42.690 Or that's nine plus nine. 0:05:42.690,0:05:44.060 Also eighteen. 0:05:44.060,0:05:45.930 What's two times ten? 0:05:45.940,0:05:47.940 And ten times tables are interesting. 0:05:47.940,0:05:49.550 And we're going to see a pattern there in a second 0:05:49.560,0:05:53.040 when we try to complete an entire times tables. 0:05:53.040,0:05:54.640 So two times ten? 0:05:54.640,0:05:56.800 Two more than two times nine. 0:05:56.810,0:05:59.050 It's twenty. 0:05:59.050,0:06:01.050 Or we could also say that's ten plus ten. 0:06:01.060,0:06:03.360 Ten plus itself two times. 0:06:03.360,0:06:05.060 Now what's interesting about this? 0:06:05.060,0:06:09.115 This looks just like a two with a zero added. 0:06:09.115,0:06:10.690 And you're going to see that with anything times ten, 0:06:10.690,0:06:12.295 you just put a zero on the right. 0:06:12.295,0:06:14.130 And you can think about why that is. 0:06:14.130,0:06:16.410 You can view this as two tens is twenty. 0:06:16.420,0:06:18.000 That's what twenty is. 0:06:18.000,0:06:19.540 We're almost done. 0:06:19.550,0:06:21.820 Let's do two times eleven. 0:06:21.820,0:06:25.920 Two times eleven is going to be two more than this right here. 0:06:25.930,0:06:27.830 It's going to be twenty-two. 0:06:27.830,0:06:29.530 Another interesting pattern. 0:06:29.540,0:06:32.220 I have the number repeated twice-- a two and a two. 0:06:32.220,0:06:33.160 Interesting. 0:06:33.170,0:06:35.818 Something to watch out for 0:06:35.818,0:06:38.690 as we look at other multiplication tables. 0:06:38.704,0:06:40.140 And then finally-- 0:06:40.140,0:06:42.129 and it's not finally, we could keep going-- 0:06:42.129,0:06:44.682 Two times-- that's too dark of a color. 0:06:44.682,0:06:47.059 Two times twelve. 0:06:47.059,0:06:50.540 Two times twelve is going to be two more than two times eleven. 0:06:50.550,0:06:51.826 That's twenty-four. 0:06:51.826,0:06:54.160 We could have also written that as twelve plus twelve. 0:06:54.170,0:06:56.110 Or we could've said two plus two plus two plus two 0:06:56.110,0:06:57.840 plus two... twelve times. 0:06:57.850,0:06:59.660 It all gets you to twenty-four. 0:06:59.670,0:07:00.961 So that's the two times tables 0:07:00.961,0:07:01.970 and I think you see the pattern. 0:07:01.980,0:07:04.755 Every time you multiply it by one higher number 0:07:04.755,0:07:06.670 you just add two to that number. 0:07:06.680,0:07:08.748 So now that we see that pattern, 0:07:08.748,0:07:11.950 let's see if we can complete a multiplication table. 0:07:11.950,0:07:16.260 So what I want to do, I'm going to write all the numbers. 0:07:16.270,0:07:18.485 Let's see. 0:07:18.485,0:07:19.361 I hope I have space for this. 0:07:19.361,0:07:29.430 One, two, three, four, five, six, seven, eight, nine. 0:07:29.430,0:07:30.910 Actually, I'll just do it till nine. 0:07:30.920,0:07:31.830 I'll just keep going. 0:07:31.830,0:07:32.970 Nine. 0:07:32.970,0:07:34.106 Actually I won't have space to do that 0:07:34.106,0:07:35.680 because I want you to see the entire table. 0:07:35.680,0:07:37.045 So I'm just going up till nine here, 0:07:37.045,0:07:39.590 but I encourage you after this video to complete it on your own. 0:07:39.600,0:07:42.880 Maybe if we have time I'll complete it here as well. 0:07:42.880,0:07:45.887 So these are the first numbers that I'm going to multiply. 0:07:45.887,0:07:52.060 And I'm going to multiply it times one, two, three, four, 0:07:52.060,0:07:57.650 five, six, seven, eight, and nine. 0:07:57.650,0:08:00.183 What I'm going to do is, I'm going to-- 0:08:00.183,0:08:01.298 So first of all-- 0:08:01.298,0:08:03.321 Actually I should have written this one under-- 0:08:03.321,0:08:04.710 well, what's one times one? 0:08:04.720,0:08:06.110 So this is the way I'm going to view it. 0:08:06.120,0:08:08.730 Whatever is one times one I'm going to write here. 0:08:08.730,0:08:09.970 Well that's one. 0:08:09.970,0:08:11.510 What's one times two? 0:08:11.510,0:08:12.400 That's two. 0:08:12.410,0:08:13.730 What's one times three? 0:08:13.740,0:08:14.360 That's three. 0:08:14.360,0:08:15.866 One times anything is that number, 0:08:15.866,0:08:21.360 so I can just write four, five, six, seven, eight, nine. 0:08:21.370,0:08:23.540 One times nine is nine. 0:08:23.540,0:08:24.540 Fair enough. 0:08:24.540,0:08:26.300 Now let's do the two times tables. 0:08:26.310,0:08:27.570 I'll do that in a blue. 0:08:27.570,0:08:30.270 Actually, let me do one in that color 0:08:30.285,0:08:33.980 and now in maybe a darker blue I'll do the two times tables. 0:08:33.990,0:08:35.250 What's two times one? 0:08:35.250,0:08:36.430 That's two. 0:08:36.440,0:08:37.690 It's the same thing as one times two. 0:08:37.700,0:08:40.000 Notice, these two numbers are the same thing. 0:08:40.000,0:08:41.700 What's two times two? 0:08:41.710,0:08:43.000 That's four. 0:08:43.000,0:08:44.610 Two times three is six. 0:08:44.620,0:08:45.840 We just did this. 0:08:45.840,0:08:49.821 Every time you increment or you multiply by a higher number, 0:08:49.821,0:08:51.190 you just add by two. 0:08:51.190,0:08:52.840 Two times four is eight. 0:08:52.850,0:08:55.110 Same thing as four times two. 0:08:55.120,0:08:57.260 Two times five is ten. 0:08:57.260,0:08:59.010 Two times six is twelve. 0:08:59.010,0:09:00.660 I'm just adding two every time. 0:09:00.670,0:09:03.970 Up here I added one from every step, here I'm adding two. 0:09:03.980,0:09:06.830 Two times seven, fourteen. 0:09:06.830,0:09:09.813 Two times eight, sixteen. 0:09:09.813,0:09:12.970 Two times nine, eighteen. 0:09:12.980,0:09:17.789 All right, let's do our three times tables. 0:09:17.789,0:09:20.508 I'll do it in yellow. 0:09:20.508,0:09:21.783 Yellow. 0:09:21.783,0:09:23.828 Three times one is three. 0:09:23.828,0:09:25.350 Notice, three times one is three. 0:09:25.360,0:09:26.910 One times three is three. 0:09:26.910,0:09:28.740 These are the same values. 0:09:28.750,0:09:32.158 Three times two is the same thing as two times three. 0:09:32.158,0:09:37.640 Three times two should be the same thing as two times three. 0:09:37.640,0:09:39.680 So it's six. 0:09:39.690,0:09:40.485 And that makes sense. 0:09:40.485,0:09:45.690 Three plus three is six or two plus two plus two is six. 0:09:45.690,0:09:47.780 So every time here we're going to increase by three. 0:09:47.780,0:09:48.880 You see the pattern. 0:09:48.880,0:09:51.000 Three times three is nine. 0:09:51.010,0:09:52.852 Three plus three plus three. 0:09:52.852,0:09:54.725 So we went from three to six to nine. 0:09:54.736,0:09:57.001 So three times four is going to be twelve. 0:09:57.001,0:09:58.850 I'm just adding three every time. 0:09:58.850,0:10:00.642 Twelve plus three is fifteen. 0:10:00.642,0:10:03.404 Fifteen plus three is eighteen. 0:10:03.404,0:10:05.580 Eighteen plus three is twenty-one. 0:10:05.580,0:10:08.080 Twenty-one plus three is twenty-four. 0:10:08.090,0:10:10.500 Twenty-four plus three is twenty-seven. 0:10:10.500,0:10:13.110 So three times nine is twenty-seven. 0:10:13.120,0:10:14.840 Three times eight is twenty-four. 0:10:14.840,0:10:19.094 So if you were to say eight plus eight plus eight, it would be twenty-four. 0:10:19.094,0:10:20.180 Let's see if I can-- 0:10:20.180,0:10:21.544 So now I'm going to speed it up a little bit, 0:10:21.544,0:10:22.830 now that we see the pattern. 0:10:22.840,0:10:24.088 And you should do this on your own 0:10:24.088,0:10:26.970 and you really should memorize everything we're doing. 0:10:26.980,0:10:30.495 You should actually go all the way up to twelve in both directions. 0:10:30.495,0:10:31.057 So let's see. 0:10:31.057,0:10:35.330 Four times one is four. 0:10:35.330,0:10:37.640 I'm just going to go up by increments of four. 0:10:37.640,0:10:40.080 So four plus four is eight. 0:10:40.090,0:10:41.960 Eight plus four is twelve. 0:10:41.970,0:10:43.920 Twelve plus four is sixteen. 0:10:43.920,0:10:46.450 Sixteen plus four is twenty. 0:10:46.460,0:10:48.460 Twenty plus four is twenty-four. 0:10:48.460,0:10:51.460 Four times six is twenty-four. 0:10:51.470,0:10:52.970 Four times seven, twenty-eight. 0:10:52.980,0:10:54.250 I'm just going up by four. 0:10:54.250,0:10:58.740 Thirty-two and thirty-six. 0:10:58.750,0:11:01.490 All right, five times one. 0:11:01.490,0:11:06.670 Five times one is going to be five. 0:11:06.670,0:11:09.565 Actually, we know that anything that-- well, I want us to keep changing colors, 0:11:09.565,0:11:11.400 so I'll just do it in rows like this. 0:11:11.410,0:11:12.570 Five times one is five. 0:11:12.580,0:11:15.780 Five times two is ten. 0:11:15.780,0:11:17.260 Five times three is fifteen. 0:11:17.260,0:11:18.430 I'm just going to increase by five. 0:11:18.440,0:11:20.687 Five times tables are very fun as well 0:11:20.687,0:11:24.120 because every number you're going to add-- if we multiply five times-- 0:11:24.120,0:11:25.870 well, we'll learn about even and odd in the future. 0:11:25.880,0:11:30.241 But every other number in its times tables is going to end with a five, 0:11:30.241,0:11:32.240 and then every other one's going to end with a zero. 0:11:32.250,0:11:34.790 Because if you add five to fifteen you get twenty. 0:11:34.790,0:11:41.871 You get twenty-five, thirty, thirty-five, forty, forty-five. 0:11:41.871,0:11:43.380 Fair enough. 0:11:43.380,0:11:47.120 Six times tables, let me do it in green. 0:11:47.120,0:11:48.210 Six times one is six. 0:11:48.220,0:11:49.080 That's easy. 0:11:49.080,0:11:50.800 You add six to that, you get twelve. 0:11:50.800,0:11:52.490 You add six to that, you get eighteen. 0:11:52.500,0:11:54.250 You add six to that, you get twenty-four. 0:11:54.250,0:11:56.220 You add six to that, you get thirty. 0:11:56.220,0:12:01.220 Then you go six more, thirty-six, forty-two, forty-eight. 0:12:01.220,0:12:04.620 Forty-eight plus six is fifty-four. 0:12:04.620,0:12:07.620 So six times nine is fifty-four. 0:12:07.620,0:12:08.990 All right, we're almost there. 0:12:09.000,0:12:11.610 Seven times one, that's seven. 0:12:11.620,0:12:13.520 Seven times one is seven. 0:12:13.520,0:12:15.610 Seven times two is fourteen. 0:12:15.620,0:12:17.740 Seven times three, twenty-one. 0:12:17.740,0:12:20.040 Seven times four, twenty-eight. 0:12:20.040,0:12:23.512 Seven times five, what's twenty-eight plus seven? 0:12:23.512,0:12:25.130 Let's see, if you add two you get to thirty. 0:12:25.130,0:12:27.700 Then you add five, it's thirty-five. 0:12:27.710,0:12:29.480 Seven times six, forty-two. 0:12:29.490,0:12:32.640 Seven times seven, forty-nine. 0:12:32.640,0:12:34.775 Seven times eight-- 0:12:34.775,0:12:37.830 seven times is going to be seven plus this, so it's fifty-six. 0:12:37.830,0:12:41.580 I always used to get confused between seven times eight being fifty-six 0:12:41.590,0:12:43.610 and six times nine being fifty-four. 0:12:43.620,0:12:46.705 So now that I pointed out to you that I always got confused between those two, 0:12:46.705,0:12:49.389 it's your job not to be confused by those two. 0:12:49.390,0:12:52.610 Seven times eight you could say has the six in it. 0:12:52.620,0:12:54.850 Six times nine doesn't have the six in it. 0:12:54.850,0:12:56.080 That's the way I think of it. 0:12:56.080,0:12:57.580 Anyway, seven times nine. 0:12:57.580,0:12:59.320 We're going to add another seven here. 0:12:59.320,0:13:01.152 It's going to be sixty-three. 0:13:01.152,0:13:04.830 I'll do it in the same color. 0:13:04.840,0:13:08.350 All right, we're at our eight times tables. 0:13:08.360,0:13:10.660 Eight times one is eight. 0:13:10.660,0:13:12.520 Eight times two is sixteen. 0:13:12.520,0:13:14.090 Twenty-four. 0:13:14.100,0:13:15.690 Eight times three is twenty-four. 0:13:15.690,0:13:18.300 And if we go to three times eight we should also see the twenty-four. 0:13:18.300,0:13:19.500 Yep, it's there. 0:13:19.500,0:13:21.110 These values are the same. 0:13:21.120,0:13:22.800 So we're actually doing things twice. 0:13:22.800,0:13:24.848 We're doing it when you do eight times three 0:13:24.848,0:13:27.470 and we're doing it when we did three times eight. 0:13:27.472,0:13:31.210 Let's see, eight times four, you're going to add eight to it-- thirty-two. 0:13:31.220,0:13:32.480 Forty. 0:13:32.490,0:13:34.690 Add another eight, forty-eight. 0:13:34.690,0:13:37.270 Notice, eight times six, forty-eight. 0:13:37.270,0:13:40.230 Six times eight, forty-eight. 0:13:40.240,0:13:42.450 All right, eight times seven. 0:13:42.450,0:13:45.860 Well, we already pointed that one out, that was fifty-six. 0:13:45.870,0:13:48.200 Eight times eight, sixty-four. 0:13:48.200,0:13:52.010 Eight times nine, add eight to this, is seventy-two. 0:13:52.010,0:13:54.640 Now we're at the nine times tables. 0:13:54.650,0:13:57.260 I'm running out of colors. 0:13:57.260,0:13:59.520 Maybe I'll reuse a color or two. 0:13:59.530,0:14:01.100 I'll use the blue again. 0:14:01.110,0:14:03.280 Nine times one is nine. 0:14:03.280,0:14:06.700 Nine times two, eighteen nine times three-- we actually know all of these. 0:14:06.710,0:14:08.097 We could look it up in the rest of the table 0:14:08.097,0:14:11.290 because nine times three is the same thing as three times nine. 0:14:11.290,0:14:13.280 It's twenty-seven. 0:14:13.280,0:14:14.500 Add nine to that. 0:14:14.500,0:14:18.380 Twenty-seven plus nine is thirty-six. 0:14:18.390,0:14:21.520 Thirty-six plus nine is forty-five. 0:14:21.530,0:14:25.331 Notice, every time you add nine, you go almost up by ten, 0:14:25.331,0:14:26.219 but one less than that. 0:14:26.219,0:14:29.970 So up by ten would be forty-six, and then one less than that is forty-five. 0:14:29.970,0:14:32.647 But anyway, notice, the ones-- 0:14:32.647,0:14:33.880 well, I'll talk more about it in the future. 0:14:33.890,0:14:37.510 But we go from a nine, eight, seven, six, five on this digit, 0:14:37.520,0:14:38.835 on the second digit. 0:14:38.835,0:14:42.510 And on this digit here you go one, two, three, four. 0:14:42.510,0:14:44.010 So it's an interesting pattern. 0:14:44.020,0:14:47.240 Another interesting pattern is the digits will add up to nine. 0:14:47.250,0:14:49.270 Three plus six is nine, two plus seven is nine. 0:14:49.270,0:14:50.831 We'll talk more about that in the future 0:14:50.831,0:14:52.620 and maybe prove that to you. 0:14:52.630,0:14:56.340 Nine times six, fifty-four. 0:14:56.350,0:14:58.150 That was this one as well. 0:14:58.150,0:15:01.720 Nine times seven, sixty-three. 0:15:01.730,0:15:03.850 Nine times eight, seventy-two. 0:15:03.860,0:15:05.910 Nine times nine is eighty-one. 0:15:05.910,0:15:07.030 I don't know if you can see that. 0:15:07.040,0:15:08.360 Eighty-one. 0:15:08.370,0:15:09.480 There you go. 0:15:09.480,0:15:11.080 Now, I could keep going. 0:15:11.080,0:15:13.780 Actually, I should keep going. 0:15:13.780,0:15:17.525 Well, I realize this video is already pretty long. 0:15:17.525,0:15:19.316 I want you to memorize this right now 0:15:19.316,0:15:21.200 because this is going to get you pretty far. 0:15:21.210,0:15:25.542 In the next video I'm going to do the times tables past nine. 0:15:25.542,0:15:26.960 See you soon!