Factor trees
Factors are the special name for numbers you multiply together to get another number. 24 has these factors: 1, 2, 3, 4, 6, 8, 12, 24. This is because when you put them in pairs and and multiply you make 24: 1 x 24, 2 x 12, 3 x 8, 4 x 6. The two factors in the sums are called factor pairs.
We can create factor trees to show the different ways we can multiply numbers together to make the same answer. It's best to stop before you use 1 so we keep the factor tree looking nice and simple.
We can create factor trees to show the different ways we can multiply numbers together to make the same answer. It's best to stop before you use 1 so we keep the factor tree looking nice and simple.
Here are two ways you can create a factor tree for 48
Here's one of the ways to create a factor tree for 60.
Can you do another factor tree for 60? For 80? For 96?
Using factors
If you want to multiply a big number (say 24 x 8), it might help to use their factor pairs. And if one factor is 2 it might be best to use it last as then you are just left with doubling the number.
Example: 24 x 8
24 has a factor pair of 8 x 3
8 has a factor pair 2 x 4
The four factors above in order are 2 ,3 ,4, and 8. So 24 x 8 is the same as 2 x 3 x 4 x 8
One way we could multiply the factors is 3 x 4 = 12; 12 x 8 = 96; 96 x 2 = 192
So 24 x 8 is 192
If you want to multiply a big number (say 24 x 8), it might help to use their factor pairs. And if one factor is 2 it might be best to use it last as then you are just left with doubling the number.
Example: 24 x 8
24 has a factor pair of 8 x 3
8 has a factor pair 2 x 4
The four factors above in order are 2 ,3 ,4, and 8. So 24 x 8 is the same as 2 x 3 x 4 x 8
One way we could multiply the factors is 3 x 4 = 12; 12 x 8 = 96; 96 x 2 = 192
So 24 x 8 is 192