# Chapter 2 - Multiplying and Dividing Fractions - 2.4 Writing a Fraction in Lowest Terms - 2.4 Exercises - Page 136: 4

3

#### Work Step by Step

If the sum of a number's digits is divisible by 3, we know that the number itself must also be divisible by 3. For example, the sum of the digits of 63 is $6+3=9$, which is divisible by 3. Therefore, 63 must be divisible by 3. $63\div3=21$

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