How to find the least common multiple - GRE Quantitative Reasoning

Card 1 of 32

0
Didn't Know
Knew It
0
1 of 2019 left
Question

If a is the greatest common divisor of 64 and 14 and b is the least common multiple of 16 and 52 then a + b = ?

Tap to reveal answer

Answer

The greatest common divisor of 64 and 14 is 2, as found by the prime factorization of 64 and 14. The least common multiple of 16 and 52 is 208, which can be found by looking at the decimal when 52 is divided by 16. The remainder is 0.25, or 1/4 so the fourth multiple of 52 is 208, which is also divisible by 16.

← Didn't Know|Knew It →