How do you multiply whole number and mixed numbers?

Lets call the whole number 'a' and the mixed number 'b c/d'. The latter is equal to b + c/d.

a * (b + c/d) = a*b + a*c/b -which mean you can multiply the integer of the mixed number by 'a' and the fraction by 'a' - then add them together.

An example: 3 * 2½ = 3*2 + 3*½ = 6 + 3/2 = 6+ 1+½ = 7½