Re-write the compound fraction by separating the integer and fractional parts.
For example, 4 2/3 can be rewritten as 4 + 2/3.
Convert the whole number to a fraction that shares the denominator with the fractional part.
In the example, the denominator of the fractional part is 3. So you can multiply 4 times 3/3 --- remember, you can multiply any number by 1 and not change its value. 4 * (3/3) is 12/3.
Substitute the new expression for the integer back into the expression for the compound fraction you came up with in Step 1.
4 + 2/3 = 12/3 + 2/3 = 14/3.
Use the new expression for the compound fraction to add, subtract, divide or multiply.