1 00:00:00,660 --> 00:00:04,092 We've got 24 triangle things right over here. 2 00:00:04,092 --> 00:00:05,550 And what I want to do in this video 3 00:00:05,550 --> 00:00:09,130 is to divide it into different numbers of groups. 4 00:00:09,130 --> 00:00:10,600 So the first thing I want to do is 5 00:00:10,600 --> 00:00:16,760 I want to divide this 24 triangle things into 3 groups 6 00:00:16,760 --> 00:00:20,020 and think about how many do I end up per group. 7 00:00:20,020 --> 00:00:21,660 So let's try that out. 8 00:00:21,660 --> 00:00:24,370 So I'm going to divide it into 3 equal groups. 9 00:00:24,370 --> 00:00:28,450 So that is one equal group right over there. 10 00:00:28,450 --> 00:00:32,470 Then I have another equal group right over here. 11 00:00:32,470 --> 00:00:36,340 And then I have a third equal group right over here. 12 00:00:36,340 --> 00:00:42,280 So if I divide 24 into 3 equal groups-- 1, 2, 3-- how many 13 00:00:42,280 --> 00:00:43,890 are going to be in each group? 14 00:00:43,890 --> 00:00:44,970 Well, we can count that. 15 00:00:44,970 --> 00:00:52,500 We have 1, 2, 3, 4, 5, 6, 7, 8 in each group. 16 00:00:52,500 --> 00:00:59,239 So we could say that 24 divided by 3 is equal to 8. 17 00:00:59,239 --> 00:01:00,780 Now, you might say, hey, this is very 18 00:01:00,780 --> 00:01:02,488 similar to what we saw in multiplication. 19 00:01:02,488 --> 00:01:06,830 In multiplication, we said if we have 3 groups of 8, 20 00:01:06,830 --> 00:01:10,720 we could view that as 3 times 8 and get 24. 21 00:01:10,720 --> 00:01:12,035 And you are exactly right. 22 00:01:14,670 --> 00:01:18,940 Let me do those same colors-- we could also write that 3 23 00:01:18,940 --> 00:01:25,620 times 8-- so if I have 3 groups of 8, 24 00:01:25,620 --> 00:01:32,040 that that is going to be equal to 24. 25 00:01:32,040 --> 00:01:34,580 So when we started in this video, we had 24 things. 26 00:01:34,580 --> 00:01:37,440 We want to divide it into 3 equal groups. 27 00:01:37,440 --> 00:01:42,780 We got 8 in each group, or you could say 3 equal groups of 8 28 00:01:42,780 --> 00:01:45,160 is equal to 24. 29 00:01:45,160 --> 00:01:47,620 But there's even other ways of thinking about this. 30 00:01:47,620 --> 00:01:49,840 So let me clear this up a little bit. 31 00:01:49,840 --> 00:01:51,390 So let me clear that. 32 00:01:54,450 --> 00:01:59,460 So in the first example, I divided 24 into 3 equal groups. 33 00:01:59,460 --> 00:02:02,730 But you could also view 24 divided by 3 34 00:02:02,730 --> 00:02:05,500 as dividing 24 into groups of 3. 35 00:02:05,500 --> 00:02:07,890 So let's think about what that looks like. 36 00:02:07,890 --> 00:02:10,680 So if we divide it into groups of 3, 37 00:02:10,680 --> 00:02:15,270 then, for example, this is a group of 3. 38 00:02:15,270 --> 00:02:17,860 That is a group of 3. 39 00:02:17,860 --> 00:02:19,494 This is a group of 3. 40 00:02:19,494 --> 00:02:20,910 You might see where this is going. 41 00:02:20,910 --> 00:02:23,050 That's a group of 3. 42 00:02:23,050 --> 00:02:25,430 That is another group of 3. 43 00:02:25,430 --> 00:02:27,570 And we're going to think about how many groups of 3 44 00:02:27,570 --> 00:02:29,190 we're actually going to get. 45 00:02:29,190 --> 00:02:32,780 So this is another group of 3. 46 00:02:32,780 --> 00:02:35,750 And that's another group of 3. 47 00:02:35,750 --> 00:02:38,490 So how many groups of 3 did we get? 48 00:02:38,490 --> 00:02:45,120 Let's see, we have 1, 2, 3, 4, 5, 6, 7, 8 groups of 3. 49 00:02:45,120 --> 00:02:50,580 So another way of viewing 24 divided by 3 50 00:02:50,580 --> 00:02:54,450 is divide 24 into groups of 3. 51 00:02:54,450 --> 00:02:57,120 And then you will have 8 groups of 3. 52 00:02:57,120 --> 00:02:58,620 And one way of thinking about this-- 53 00:02:58,620 --> 00:03:01,900 if you want to express the same thing in terms 54 00:03:01,900 --> 00:03:03,550 of multiplication-- is if you have 55 00:03:03,550 --> 00:03:13,070 8 groups of 3, that is also going to be equal to 24. 56 00:03:13,070 --> 00:03:18,140 Whether you have 3 groups of 8 or 8 groups of 3, 57 00:03:18,140 --> 00:03:21,820 either way, you're going to have 24. 58 00:03:21,820 --> 00:03:25,830 Now, let's make things more interesting. 59 00:03:25,830 --> 00:03:30,650 What I want you to think about is, based on what we just saw, 60 00:03:30,650 --> 00:03:37,640 what is 24 divided by 12? 61 00:03:37,640 --> 00:03:39,330 And I encourage you to pause the video, 62 00:03:39,330 --> 00:03:42,050 draw out 24 triangles like this, and try 63 00:03:42,050 --> 00:03:46,460 to figure out what 24 divided by 12 is. 64 00:03:46,460 --> 00:03:48,170 Well, I assume you've paused the video. 65 00:03:48,170 --> 00:03:51,260 And there's two ways to think about 24 divided by 12. 66 00:03:51,260 --> 00:03:55,860 You could say, well, let's divide 24 into groups of 12 67 00:03:55,860 --> 00:03:57,720 and think about how many groups we have. 68 00:03:57,720 --> 00:03:58,660 So we could do that. 69 00:03:58,660 --> 00:03:59,201 So let's see. 70 00:03:59,201 --> 00:04:04,530 This is one group of 12 right over here. 71 00:04:04,530 --> 00:04:10,000 That's one group of 12, and then here is another group of 12. 72 00:04:10,000 --> 00:04:13,080 So how many groups of 12 do we have? 73 00:04:13,080 --> 00:04:14,780 Well, we have 2 groups of 12. 74 00:04:14,780 --> 00:04:19,120 So we could say 24 divided by 12 is 2. 75 00:04:19,120 --> 00:04:23,010 But another just as reasonable way of doing this is you 76 00:04:23,010 --> 00:04:27,190 could have said, well, let me divide 24 77 00:04:27,190 --> 00:04:30,460 into 12 groups instead of groups of 12. 78 00:04:30,460 --> 00:04:32,240 So if I want to divide it into 12 groups, 79 00:04:32,240 --> 00:04:34,530 12 equal groups-- well, let's see. 80 00:04:34,530 --> 00:04:38,749 This is 1 equal group, 2 equal groups-- 81 00:04:38,749 --> 00:04:40,040 actually let me do it this way. 82 00:04:40,040 --> 00:04:54,600 Well, let me do this-- 2 equal groups, 3 4, 5, 6, 7, 8, 9, 10, 83 00:04:54,600 --> 00:04:56,840 11, 12. 84 00:04:56,840 --> 00:04:59,910 So once again, if you say, oh, I'm going to divide 24 into 12 85 00:04:59,910 --> 00:05:02,480 equal groups, how many do you have in each group? 86 00:05:02,480 --> 00:05:03,620 Well, you have 2. 87 00:05:03,620 --> 00:05:05,100 So once again, 24 could be viewed 88 00:05:05,100 --> 00:05:07,585 as 24 divided into 12 equal groups. 89 00:05:07,585 --> 00:05:09,210 And how many do you have in each group? 90 00:05:09,210 --> 00:05:12,860 Or 24 divided into groups of 12, and how many groups would 91 00:05:12,860 --> 00:05:13,420 you have? 92 00:05:13,420 --> 00:05:16,020 And that's what we saw in the last example. 93 00:05:16,020 --> 00:05:18,940 So now, let's make things even more interesting. 94 00:05:18,940 --> 00:05:21,840 What I want you to think about-- a couple of things. 95 00:05:21,840 --> 00:05:31,100 I want you think about what 24 divided by 6 is. 96 00:05:31,100 --> 00:05:36,215 And I also want you to figure out what 24 divided by-- 97 00:05:36,215 --> 00:05:41,070 let me use that same color-- 4 is. 98 00:05:41,070 --> 00:05:43,450 And once again, I encourage you to pause the video, 99 00:05:43,450 --> 00:05:45,170 draw these triangles, and figure it out. 100 00:05:45,170 --> 00:05:49,210 What is 24 divided by 6 and 24 divided by 4? 101 00:05:49,210 --> 00:05:51,360 So let's tackle 24 divided by 6 first. 102 00:05:51,360 --> 00:05:59,239 And let's try to divide 24 into 6 equal groups. 103 00:05:59,239 --> 00:05:59,780 So let's see. 104 00:05:59,780 --> 00:06:05,310 This could be 1 equal group, 2 equal groups-- in fact, 105 00:06:05,310 --> 00:06:09,490 each group here is a group of 4. 106 00:06:09,490 --> 00:06:11,300 And we have 6 rows. 107 00:06:11,300 --> 00:06:19,190 So 3 equal groups, 4, 5, and 6. 108 00:06:19,190 --> 00:06:23,150 And so if you divide 24 into 6 equal groups, 109 00:06:23,150 --> 00:06:24,690 how many do you have in each group? 110 00:06:24,690 --> 00:06:27,780 Well, it's pretty clear you have 4. 111 00:06:27,780 --> 00:06:29,406 You have 4 In each group. 112 00:06:29,406 --> 00:06:30,780 Another way we could have thought 113 00:06:30,780 --> 00:06:39,710 about that is we could have said, 114 00:06:39,710 --> 00:06:43,220 let me divide 24 into groups of 6. 115 00:06:43,220 --> 00:06:45,860 So if you divided 24 into groups of 6, 116 00:06:45,860 --> 00:06:49,000 you could have viewed it like this. 117 00:06:49,000 --> 00:06:53,490 So that's 1 group of 6 right there. 118 00:06:53,490 --> 00:06:57,090 That's another group of 6 right over here. 119 00:06:57,090 --> 00:06:58,475 That's another group of 6. 120 00:06:58,475 --> 00:07:01,480 And I think you see how many groups of 6 we have. 121 00:07:01,480 --> 00:07:03,056 How many groups of 6 do we have? 122 00:07:03,056 --> 00:07:04,484 We have 4. 123 00:07:04,484 --> 00:07:10,120 We have 4 groups of 6. 124 00:07:10,120 --> 00:07:13,370 Well, now let's think about what 24 divided by 4 is. 125 00:07:13,370 --> 00:07:18,400 Well, if I view 24 divided by 4 as taking 24 and dividing it 126 00:07:18,400 --> 00:07:20,780 into 4 equal groups, I've just drawn that. 127 00:07:20,780 --> 00:07:23,965 I have 4 equal groups, and in each group I have 6. 128 00:07:27,740 --> 00:07:30,453 So notice 24 divided by 6 is 4. 129 00:07:30,453 --> 00:07:33,900 24 divided by 4 is 6. 130 00:07:33,900 --> 00:07:38,100 And that's because I could view this as 4 groups of 6 131 00:07:38,100 --> 00:07:44,140 or say that 4 times 6 is equal to 24. 132 00:07:47,140 --> 00:07:50,890 Or you could just as equivalently say that 6 times 4 133 00:07:50,890 --> 00:07:52,570 is 24. 134 00:07:52,570 --> 00:08:00,198 You could equivalently say that 6 times 4 is equal to 24.