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To find out how much sugar Ms Johnson used, we need to multiply the fraction representing the sugar she used (1/2) by the total amount of sugar in the canister (7/8).
To multiply fractions, we multiply the numerators (top numbers) together and the denominators (bottom numbers) together.
So, (1/2) * (7/8) = (1*7) / (2*8) = 7/16.
Therefore, Ms Johnson used 7/16 cups of sugar when preparing the dessert for her daughter's birthday cake.