Question

D
which is the greatest common divisor of 72, 81 and 180?
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Answer 1

Answer:

Find the prime factorization of 72

72 = 2 × 2 × 2 × 3 × 3

Find the prime factorization of 180

180 = 2 × 2 × 3 × 3 × 5

To find the gcf, multiply all the prime factors common to both numbers:

Therefore, GCF = 2 × 2 × 3 × 3

GCF = 36

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Answer 2

Factors of 72 :-

2×2×2×3×3

Factors of 81 :-

3×3×3×3

Factors of 180 :-

2×2×3×3×5

greatest common factor:-3×3 = 9

Let check :-

72÷9= 8

81 ÷9= 9

180 ÷9= 20

checked

so your answer is greatest common factor =9

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