#### Answer

(a) You can find 50% of a number by dividing by 2.
(b) 50% of 10 is solved by the equation 10$\div$2=5.

#### Work Step by Step

You can find 50% of a number by dividing by 2 because when you change 50% to a decimal it is 0.5, or $\frac{1}{2}$. To find half of any number you divide it by 2.