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Q: Which pair of numbers has a GCF of 21 40?

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30 and 40

Not at all. For example: gcf(101, 102) = 1 gcf(40, 80) = 40

The GCF is 8.

The GCF is 8.

Which pair of numbers has an LCM of 40?

The GCF is 1.

The GCF is 1.

The GCF of 21 and 40 is 1.

The GCF of these numbers is 40.

The GCF is 1.

The GCF is 1.

42

the answer to GCF of 24 & 40 is 8

The GCF is 5.

Two pairs of numbers with a GCF of 8 and an LCM of 360 are 360 and 8 and 72 and 40

The GCF of 40, 14, and 21 is 1.

The LCM of 32 and 40 is 160. The least common multiple of a pair can be found by multiplying the numbers and dividing by their GCF. We know the GCF cannot be greater than the difference between the two numbers, which, in this case is 8. Since 8 divides into 32 and 40 evenly, we know it is the GCF. 32 * 40 / 8 = 160, so that is the LCM of 32 and 40.

The GCF of 20 and 40 is 20. The GCF of 40 and 80 is 40.

The GCF is 1.

GCF(20, 25, 35, 40) = 5 The GCF of any set of numbers is also a factor of the difference of any pair of them. So the GCF must be a factor of 5 (= 25-20). This narrows down the options quite considerably!

(4 x 11) + (4 x 10) = 4 x 21 = 84

The GCF of 5 and 8 is 1. The LCM is 40.

8

The GCF of 24, 40, and 56 is 8The GCF is 8.

The GCF of one number is itself. To find the GCF, two or more numbers are needed.

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