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Multiplying a fraction by negative one

How to multiply a fraction by negative 1?

Rule for multiplying fractions by negative one:

Multiply the numerator by the negative number.

See What is the denominator of a whole number?

Examples of multiplying fractions by by negative one

Example 1: Multiplying of the fraction by negative 1

2 * (-1)
19

We can write

2 * -1
191

Multiply the numerator 2 by the numerator -1 and the denominator 19 by the denominator 1:

2 * (-1)
19 * 1

We obtain the answer

-2
19