Number Theory

Greatest Common Divisor / Lowest Common Multiple

Greatest Common Divisor

         

What is the common divisor of 33 33 and 55 55 except 11?

Simplify22×32×3×5.\dfrac{2^2 \times 3}{2 \times 3 \times 5} .

What is the greatest common divisor of 35 and 91?

What is the gcd(A, B) if:

A = 6×35, 6 \times 35, and
B = 8×15? 8 \times 15?

Simplify 1520.\dfrac{15}{20}.

Details and assumptions:
- You may use the fact that 15=3×5 15= 3 \times 5 and 20=4×5 20 = 4 \times 5.

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