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Multiplying fractions with common denominator

How do you multiply fractions with common denominator?

Multiplying fractions with common denominator is easy.

We multiply the numerator by the numerator and the denominator by the denominator.

Examples of multiplying fractions with common denominator

Example 1.

Multiply fractions with common denominator:

4 * 7
99

We multiply the numerator 4 by the numerator 7 and the denominator 9 by the denominator 9:

4 * 7 = 28
9 * 981

Example 2.

Multiply fractions with common denominator:

4 * 7 + b
99

We multiply the numerator 4 by the numerator (7 + b) and the denominator 9 by the denominator 9:

4 * (7 + b) = 28 + 4b
9 * 981

Example 3.

Multiply fractions with common denominator:

4 * 7
9 + c9 + c

Multiply the numerator 4 by the numerator 7 and the denominator (9 + c) by the denominator (9 + c):

4 * 7 = 28
(9 + c) * (9 + c)(9 + c)2