Multiplying Fractions by Whole Numbers — Answer Key
Part A: Fill in the Blank
Write the missing word or number on each line.
1. Each cookie uses 1/4 cup of sugar; 8 cookies need 2 cups.
8 x 1/4 = 8/4 = 2 cups of sugar in total.
2. One muffin needs 1/3 cup of flour; 9 muffins use 3 cups.
9 x 1/3 = 9/3 = 3 cups, since three thirds make one whole.
3. A pancake uses 1/2 cup milk; 6 pancakes need 3 cups milk.
Six halves combine to make 3 whole cups of milk.
4. Each batch needs 2/3 cup oats; 4 batches use 8/3 cups oats.
4 x 2/3 = 8/3 cups, which equals 2 2/3 cups of oats.
5. One smoothie uses 3/4 cup berries; 5 smoothies use 15/4 cups.
Fifteen fourths equals 3 3/4 cups of berries for the recipe.
6. A roll uses 1/8 cup butter; 10 rolls need 10/8 cups butter.
10 x 1/8 = 10/8 = 1 2/8, which simplifies to 1 1/4 cups.
7. Each loaf uses 5/6 cup water; 3 loaves need 15/6 cups water.
Fifteen sixths equal 2 3/6, which simplifies to 2 1/2 cups.
8. One waffle needs 2/5 cup batter; 7 waffles need 14/5 cups.
7 x 2/5 = 14/5 cups, which is the same as 2 4/5 cups.
9. A pie uses 3/8 cup butter; 4 pies need a total of 12/8 cups.
Twelve eighths equal 1 4/8, which simplifies to 1 1/2 cups.
Part B: Matching
Match each item on the left to the correct answer on the right.
1. Match each item to its correct answer.
8 cookies x 1/4 cup
→ 2 cups
2 cups
9 muffins x 1/3 cup
→ 3 cups
3 cups
6 pancakes x 1/2 cup
→ 3 cups
8/3 cups
4 batches x 2/3 cup
→ 8/3 cups
5/4 cups
Recipes scale by multiplying each ingredient fraction by the number of servings.