There are 7/8 cups of sugar in canister in the kitchen. Ms Johnson used 1/2 of the sugar when she was preparing dessert for her daughter’s birthday cake. How much sugar did she use?

To find how much sugar Ms Johnson used, we need to multiply 7/8 by 1/2.

7/8 * 1/2 = (7*1)/(8*2) = 7/16
Ms Johnson used 7/16 cups of sugar. Answer: \boxed{\frac{7}{16}}.

To find out how much sugar Ms Johnson used, we need to calculate the product of 7/8 cups of sugar and 1/2:

(7/8) * (1/2)

To multiply two fractions, we multiply the numerators (the numbers on top) and the denominators (the numbers on the bottom):

7 * 1 = 7
8 * 2 = 16

Therefore, Ms Johnson used 7/16 cups of sugar when preparing the dessert for her daughter's birthday cake.