Reciprocal

Flip the fraction. 2 ↔ 1/2. Multiply a number by its reciprocal — get 1.

The reciprocal of x is 1/x — flip the fraction.

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Reciprocal of 4

1/4.

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Reciprocal of 2/3

3/2.

x · (1/x) = 1 for any x ≠ 0. Zero has no reciprocal.