Q: Why -1 multiply -1 equal 1?

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How about 1 * 122 ? or 10 * 12.2 ?

5 inches equals 500 miles. If you multiply 100 by 5 you must multiply 1 inch by 5.

608

1 x 89, 89 x 1

8 & 1

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Multiply it by 1/6,139

Multiply 2.875 by its reciprocal (1/2.875 or 0.347826086958622) to equal 1.

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1 and 19

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-3+1

1 x 17 or 17 x 1

To multiply fractions: multiply their numerators, then multiply their denominators.So, 1/4 x 1/4 = (1 x 1) / (4 x 4) = 1/16.

-1

-1