Question

What is the greatest common divisor (GCD) of 10 and 15?

• A. 3
• B. 2
• C. 5
• D. 10

Answer 1

The correct option is C 5

Let's find the GCD of 10 and 15 using ladder method

Using ladder method, we found the
Prime factors of 10 = 2 × 5
Prime factors of 15 = 3× 5
The gretest common factor of 10 and 15 is 5
$\therefore$ GCD of 10 and 15 is 5.