Reciprocal table

In ancient Babylonian mathematics, reciprocal tables were used to divide numbers by multiplication. If you wanted to divide by a number, you'd multiply it by the opposite entry on the table. Conversely, if you wanted to multiply a number, you'd divide it by the opposite entry on the table. Here are some examples in different number bases, including the original base 60.

Decimal
Note: the 2, 5 pair is where the 'dividing by 5 by doubling' and 'quintupling by halving' rules come from.

Duodecimal
Note: It is implied that every two quaternary digits are actually one duodecimal digit (e.g., 730 is actually 7:30). Wikiversity doesn't like alphanumeric representation.

Trigesimal
Note: It is implied that every two senary digits are actually one duodecimal digit (e.g., 730 is actually 7:30). Wikiversity doesn't like alphanumeric representation.

Base-60
Note: It is implied that every two decimal digits are actually one base-60 digit (e.g., 730 is actually 7:30). Wikiversity doesn't like alphanumeric representation.