Which pair of numbers have a GCF of 7?

1 answer:

6 0

A GCF is the greatest common factor. It is the largest number that fits into other numbers. A seven cannot fit into a number smaller than itself, that doesn't work. Try to fit 7 into a smaller number like 4, it doesn't work.

Option A is 21 and 3 and Option C is 7 and 1. Those can be eliminated because 7 is larger than 3 and 1.

Option B is 7, 14. 7 Is the largest number that goes into 7 and it goes into 14. So B works.

28 and 7 is Option D. 7 is the largest number that goes into 7 and it goes into 28, so D works.

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Read 2 more answers

Bryn's age is given by the expression 3g - 7, where g is her sister Gabriela's age. If Bryn is 17, how old is Gabriela?

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You are told that B=3g-7 and you are also told that B=17 so

3g-7=17 add 7 to both sides

3g=24 divide both sides by 3

g=8

So Gabriela is 8 years of age.

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