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# Understanding factor pairs

Use multiplication and an understanding of area to identify factor pairs for 6 and 16. Created by Sal Khan.

## Want to join the conversation?

• Do you have to memorize the multipication table to get good at factor pairs?
• Yes, memorizing the multiplication table helps you get good at factor pairs. If you don’t have the multiplication table fully memorized, you can use strategies to help you with forgotten facts. Example: suppose you know that 7x7 is 49 but you forget 7x8. You can just add 49+7 to get 56.

There are also some tests you can use, to find factors.

If the last digit is 0, 2, 4, 6, or 8, then 2 is a factor.

If the digits add to a multiple of 3, then 3 is a factor.

If the last two digits form a multiple or 4, then 4 is a factor.

If the last digit is 0 or 5, then 5 is a factor.

If 2 and 3 are factors, then so is 6.

If the last three digits form a multiple of 8, then 8 is a factor.

If the digits add to a multiple of 9, then 9 is a factor.

If the last digit is 0, then 10 is a factor.

Have a blessed, wonderful day!
• is 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 25, 30, 50, 60, 75, 100, 150 and 300 is a factor of 300 does that make sense?
• Yes, all of those numbers are factors of 300.
• How can I remember which is a Multiple and which is a Factor?
• a multiple is the answer (20 is a multiple of 5 times 4) 5 times 4 = 20
• Video transcript

- What we're going to do in this video is talk about factors and factor pairs. Now when we talk about factors, these are really numbers that can be multiplied together to make some number. So, for example, if I were to talk about factors of six, I could multiply two times three to get six and so we would say that two and three are factors of six. In fact we would also say that two and three is a factor pair for six 'cause when I multiply those two I can get six. Now to think about all of the different factor pairs for a number we could think about it in terms of area. How can we make a rectangle with area six? Well you could do it if it's two units by three units. So it could look something like this, I'll just hand draw it. So let's say it has, so let's say our rectangle looks like this. So it has two rows and then three columns and lets say these all have equal area, it's hand drawn but you can see that the area here would be two times three, which would be equal to six square units. Now, what if, what are other
• can you do it by 56 please
• 1, 2, 4, 7, 8, 14, and 28 are the factors of 56 hope this helps or i supposed to add 56 is a factor of 56
(1 vote)
• Still do not understand factor pairs
(1 vote)
• factor pair is from 3000
1*3000
2*1500
3*1000
4*750
5*600
6*500
8*375
10*300
12*250
15*200
20*150
24*125
all 12 of these pairs multiply of 3000
maybe it will be that answer
totally awesome maybe i will hope it will help you right now
well acually.