Multiplying Fractions by Whole Numbers — Answer Key
Part A: Multiple Choice
Circle the best answer for each question.
1. Maya needs 2/3 cup of flour for one batch of muffins. If she makes 5 batches, how much flour does she use in total?
A) 10/3 cups, which is 3 1/3 cups
B) 2/15 cup
C) 5/3 cups, which is 1 2/3 cups
D) 7/3 cups, which is 2 1/3 cups
Grade 4 rule: 5 x 2/3 = 10/3 = 3 1/3 cups.
2. A ribbon is 3/4 yard long. If Jordan buys 6 of these ribbons, what is the total length?
A) 9/4 yards, which is 2 1/4 yards
B) 18/4 yards, which is 4 1/2 yards
C) 3/24 yard
D) 6/4 yards, which is 1 1/2 yards
Grade 4 product 6 x 3/4 = 18/4 = 4 1/2 yards.
3. Each glass holds 1/4 liter of juice. How much juice fills 9 glasses in all?
A) 9/16 liter
B) 1/36 liter
C) 9/4 liters, which is 2 1/4 liters
D) 4/9 liter
Grade 4 unit-fraction rule: 9 x 1/4 = 9/4 = 2 1/4 liters.
4. A bookshelf has 4 shelves, and each shelf is 5/8 meter wide. What is the total width if the shelves are placed end to end?
A) 9/8 meters, which is 1 1/8 meters
B) 5/32 meter
C) 20/8 meters, which is 2 1/2 meters
D) 4/13 meter
Grade 4: 4 x 5/8 = 20/8 = 2 1/2 meters in simplest form.
Part B: Fill in the Blank
Write the correct answer on each line.
1. If one batch needs 2/3 cup flour and Maya makes 5 batches, total flour is 10/3 cups.
Grade 4 rule a x (b/c) = (a x b)/c gives 10/3.
2. Written as a mixed number, 10/3 cups equals 3 1/3 cups.
Grade 4 learners convert 10/3 to 3 1/3.
3. Six ribbons of length 3/4 yard each give a total length of 18/4 yards.
Grade 4 product 6 x 3/4 = 18/4.
4. In simplest mixed-number form, 18/4 yards equals 4 1/2 yards.
Grade 4 students simplify products to mixed numbers.
5. Nine glasses of 1/4 liter each hold a total of 9/4 liters.
Grade 4 unit-fraction rule gives 9/4 liters.