Answer:

10

Explanation:

In order to find the gcf of 30 and 40 we need to do the listing method. We need to find the factor or biggest number that can be divided by 40 and 30.

30: 40:

1x30 1x40

2x15 2x20

3x10 4x10

5x6 5x8

6x5 8x5

10x3 10x4

30= 1,2,3,6,5,10

40=-1,2,4,5,8,10

10 the biggest factor than can be both divided by 30 and 40. So the answer is 10

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Answer:

30 = 1 , 2, 3, 5, 6, 10, 15, 30

40= 1, 2, 4, 5, 8, 10, 20, 40

Their GCF = 1O