which pair of numbers has the same gcf as that of 48 and 78

A)4 and 34

B)8 and 18

C)9 and 15

D)12 and 30

Question

Anonymous Anonymous

12-02-2016
Mathematics

Answered

which pair of numbers has the same gcf as that of 48 and 78

A)4 and 34

B)8 and 18

C)9 and 15

D)12 and 30

Verified Answer :

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greatest common factor is found by finding the factors of each
factors48=2 times 2 times 2 times 2 times 3
78=2 times 3 times 13
find common group
comon group=2 times 2=6
gcf=6
find others
narrow it down by crossing out any choices with numbers not divisible by 6
(crosses out A,B,C since A has 4 and B has 8 and C has 9)

therefor the answer is D, 12 and 18
check
12=2 times 2 times 3
18=2 times 3 times 3
common group=2 times 3=6
correct

answer is D, 12 and 18

which pair of numbers has the same gcf as that of 48 and 78A)4 and 34B)8 and 18C)9 and 15D)12 and 30

Verified Answer :

Related Questions

which pair of numbers has the same gcf as that of 48 and 78

A)4 and 34

B)8 and 18

C)9 and 15

D)12 and 30