1 00:00:00,000 --> 00:00:00,420 2 00:00:00,420 --> 00:00:04,339 We're asked to multiply 5/6 times 2/3 and then simplify 3 00:00:04,339 --> 00:00:05,570 our answer. 4 00:00:05,570 --> 00:00:07,450 So let's just multiply these two numbers. 5 00:00:07,450 --> 00:00:13,089 So we have 5/6 times 2/3. 6 00:00:13,089 --> 00:00:15,029 Now when you're multiplying fractions, it's actually a 7 00:00:15,029 --> 00:00:17,469 pretty straightforward process. 8 00:00:17,469 --> 00:00:20,189 The new numerator, or the numerator of the product, is 9 00:00:20,190 --> 00:00:22,880 just the product of the two numerators, or your new top 10 00:00:22,879 --> 00:00:25,339 number is a product of the other two top numbers. 11 00:00:25,339 --> 00:00:29,239 So the numerator in our product is just 5 times 2. 12 00:00:29,239 --> 00:00:37,250 So it's equal to 5 times 2 over 6 times 3, which is equal 13 00:00:37,250 --> 00:00:43,490 to-- 5 times 2 is 10 and 6 times 3 is 18, so 14 00:00:43,490 --> 00:00:44,710 it's equal to 10/18. 15 00:00:44,710 --> 00:00:50,820 And you could view this as either 2/3 of 5/6 or 5/6 of 16 00:00:50,820 --> 00:00:53,640 2/3, depending on how you want to think about it. 17 00:00:53,640 --> 00:00:54,750 And this is the right answer. 18 00:00:54,750 --> 00:00:57,219 It is 10/18, but when you look at these two numbers, you 19 00:00:57,219 --> 00:00:59,460 immediately or you might immediately see that they 20 00:00:59,460 --> 00:01:01,500 share some common factors. 21 00:01:01,500 --> 00:01:03,990 They're both divisible by 2, so if we want it in lowest 22 00:01:03,990 --> 00:01:07,019 terms, we want to divide them both by 2. 23 00:01:07,019 --> 00:01:12,799 So divide 10 by 2, divide 18 by 2, and you get 10 divided 24 00:01:12,799 --> 00:01:17,509 by 2 is 5, 18 divided by 2 is 9. 25 00:01:17,510 --> 00:01:19,920 Now, you could have essentially done this step 26 00:01:19,920 --> 00:01:20,629 earlier on. 27 00:01:20,629 --> 00:01:22,530 You could've done it actually before we did the 28 00:01:22,530 --> 00:01:23,219 multiplication. 29 00:01:23,219 --> 00:01:24,450 You could've done it over here. 30 00:01:24,450 --> 00:01:26,450 You could've said, well, I have a 2 in the numerator and 31 00:01:26,450 --> 00:01:29,260 I have something divisible by 2 into the denominator, so let 32 00:01:29,260 --> 00:01:32,710 me divide the numerator by 2, and this becomes a 1. 33 00:01:32,709 --> 00:01:37,089 Let me divide the denominator by 2, and this becomes a 3. 34 00:01:37,090 --> 00:01:42,070 And then you have 5 times 1 is 5, and 3 times 3 is 9. 35 00:01:42,069 --> 00:01:44,199 So it's really the same thing we did right here. 36 00:01:44,200 --> 00:01:47,370 We just did it before we actually took the product. 37 00:01:47,370 --> 00:01:49,219 You could actually do it right here. 38 00:01:49,219 --> 00:01:53,890 So if you did it right over here, you'd say, well, look, 6 39 00:01:53,890 --> 00:01:56,189 times 3 is eventually going to be the denominator. 40 00:01:56,189 --> 00:02:00,030 5 times 2 is eventually going to be the numerator. 41 00:02:00,030 --> 00:02:03,659 So let's divide the numerator by 2, so this will become a 1. 42 00:02:03,659 --> 00:02:05,179 Let's divide the denominator by 2. 43 00:02:05,180 --> 00:02:07,550 This is divisible by 2, so that'll become a 3. 44 00:02:07,549 --> 00:02:13,629 And it'll become 5 times 1 is 5 and 3 times 3 is 9. 45 00:02:13,629 --> 00:02:15,210 So either way you do it, it'll work. 46 00:02:15,210 --> 00:02:18,450 If you do it this way, you get to see the things factored out 47 00:02:18,449 --> 00:02:20,909 a little bit more, so it's usually easier to recognize 48 00:02:20,909 --> 00:02:23,199 what's divisible by what, or you could do it at the end and 49 00:02:23,199 --> 00:02:25,399 put things in lowest terms. 50 00:02:25,400 --> 00:02:25,867