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Factors of 40: 1,2,4,5,8,10,20,40

1 x 40

2 x 20

4 x 10

5 x 8

Factors of 30: 1,2,3,5,6,10,15,30

1 x 30

2 x 15

3 x 10

5 x 6

Common factors: 1, 2 5, 10

10 is the highest common factor.

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Q: What is the highest common factor of 40 and 30?
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Highest common factor of 40 and 30?

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What is the highest common factor of 40 and 40?

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What is the greater common factor of 40 and 30?

Firstly, a factor of a number is another number that you can divide it by and get a whole number. The factors of 40 are: 1,2,4,5,8,10,20 and 40 The factors of 30 are: 1,2,3,5,6,10,15 and 30 Now, to find the GREATEST common factor of 40 and 30 , we would have to find the biggest number that goes into both 40 AND 30. After reading the factors above, we can see that 10 is the highest number that goes into both numbers, therefore 10 is the greatest common factor of 40 and 30.


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