Fraction by Whole Number Multiply

Student Council bought Mrs. Donnelly one dozen (12) roses. ¹/₄ of them were white roses. How many white roses were there?

• 12

• 48

• 3

• ¹/₄₈

• 3 X 1/5

• 5 x 1/3

• 1/3 + 1/3 + 1/3 +1/3 +1/3

• 2/3 + 2/3 +2/3

• 3 x 1/3

• 3 x 2/3

We can restate the problem 2/3 x 5 as "2/3 of 5." For instance, if we have 5 pounds of sugar and we only need 2/3 of it, how could we think about that? We would find 2/3 of 5 by multiplying 2/3 x 5.

What is 2/3 of 5 pounds of sugar?

• 7/3

• 7/4

• 3 1/3

• 11/3

Multiplication is combining equal groups. If we want to find out how much flour we need for three cookie recipes, we can multiply what we need for one batch by 3. If we need 3/4 cup of flour for one recipe, then we would say we need 3 groups of 3/4 cup of flour. What is 3 x 3/4?

• 2 1/4

• 4/9

• 6/4

• 9/12

16 x 3/5

• 9 2/5

• 8 8/5

• 9 3/5

• 19/5

9 x 5/6

Remember to change your answer to a mixed number and simplify your fraction (if possible).

• 45/54

• 2 1/2

• 7 1/2

• 7 5/6

3/10 x 7

Be careful how you write this down... some of you were confused before the break. This is 3/10 times 7.

• 3/70

• 2 1/10

• 21/70

• 10/10 or 1 whole

Margo was helping clean up after a class party. There were 3 boxes remaining with pizza in them. Each box had 3/8 of a pizza left. How much pizza was left in all?

• 1 1/8 pizza

• 8/9 of a pizza

• 1 3/8 pizza

• No pizza because Margo secretly ate the rest while the teacher wasn't looking.

Doug has 33 feet of rope. He wants to use 2/3 of it for his canoe. How many feet of rope will he use for his canoe?

• 66 feet

• 22 feet

• 33 feet

• 11 feet