The reciprocal of 40 = 1/40 = 0.025
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1/.625 = 8/5 = 1.6
The reciprocal of 3.1 is 3.23 (0.32258).
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The reciprocal of 9 is 1/9 or one ninth. Expressed as a decimal, this is equal to 0.1 recurring (that is, 0.1111...)
The reciprocal of 21 means 1 divided by 21 or 1/21. If you do this on a calculator (or on paper if you can divide OK) the answer is 0.0476190476190476... precisely