Rewrite the problem with the whole number written as a fraction over 1. When writing by hand, use this notation: 4 rather than 4/3, as it is clearer.
----
3
Example:
4/3 * 4 =
4/3 * 4/1 =
Multiply across the top and write the answer on the right hand side, followed by a line or a slash.
Example:
4/3 * 4/1 = 16/
Multiply across the bottom and write the answer on the right hand side, underneath the line or after the slash.
Example:
4/3 * 4/1 = 16/3
If required, reduce the answer and convert it to a mixed number.
Example:
4/3 * 4/1 = 16/3
16 and 3 share no common factors, so the fraction cannot be reduced.
Convert to a mixed number:
16/3 = 3/3 + 3/3 + 3/3 + 3/3 + 3/3 + 1/3
16/3 = 1 + 1 + 1 + 1 + 1 + 1/3
16/3 = 5 1/3