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
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The reciprocal of 40 = 1/40 = 0.025
To write 21 thousandths in decimal form, you would place the decimal point three places to the left of the digit 2, as each place value represents a power of 10. Therefore, 21 thousandths in decimal form is 0.021.
1/.625 = 8/5 = 1.6
The reciprocal of 3.1 is 3.23 (0.32258).