# Finding the Greatest Common Factor, Least Common Multiple, and other Factors

This is an MCQ-based quiz for GRE on How to find the greatest common factor, least common multiple, and other factors.

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Which of the following pairs of numbers are twin primes?

1, 2 13, 19 3, 5 1, 3 2, 3

If x is a prime number, then 3x is

cannot be determined even a prime number odd divisible by 4

Which of the following is a prime number?

9 71 15 6 51

What is the greatest common factor of 18 and 24?

3 18 6 9 24

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 = ?

210 233 120 187

What is the least common multiple of 3, 4x, 5y, 6xy, and 10y?

30xy 60xy 30x^2y^2 25xy 60x^2y^2

What is the least common multiple of 45 and 60?

180 15 25 360 225

Find the greatest common factor of 16 and 24.

4 16 2 8

What is the greatest common factor of 6930 and 288 ?

288

9

110880

18

1995840

What is the least common multiple of 350 and 6270 ?

109,725

1,097,250