Chapter CSB1.2, Problem 13E

To determine

To find: The GCF of the numbers 9, 15 and 24.

Answer to Problem 13E

The GCF is 3.

Explanation of Solution

Given information: The numbers given 9, 15, 24.

Calculation:

Prime factors of 9 are

  $9=1\times 3\times 3$

Prime factors of 15 are

  $15=1\times 3\times 5$

Prime factors of 24 are

  $24=1\times 2\times 2\times 2\times 3$

Greatest common factor of 9, 15, 24 is

  $1\times 3=3$

  $\therefore$ GCF of 9, 15, 24 = 3.