Multiplying/Dividing Fractions Using word Problems

Absent Copy

1/7,8

Example 1• OPMS released 400 balloons

at an awards celebration. Of these, 2/5 were blue. How many were blue?

• 400 = 800

1 5 800 5

2•1 •2•2•2•2•5•5 5•1

1•2•2•2•2•2•5•5 = 160 =160

5•1 1

solution

–

• What operation do we use when you see the word “of” in the problem?

• The word “OF” means to use multiplication.

• How do we set up this problem

• We set it up using a multiplication symbol.

• What goes underneath the 400?

• A 1 goes underneath the 400.

• What do we make in order to reduce this fraction?

• We make a T-chart.

• What do we do with the remaining factors?

• We multiply the remaining factor to get an answer.

160 blue 240 not

5

2

Example 3• Josh read 4/5 of a 200 page

book. How many pages did he read?

4 • 200 = 5 1 4 200 5

2•2 2•2•2•5•5 5•1

2•2•2•2•2•5•5 = 160 = 160

5•1 1

Solution

• What operation do we use when we see the word “of”?

• The word “OF” means to multiply.

• What do we do to make this problem easier?

• Make an equation using a multiplication symbol.

• What goes underneath the 200?

• A 1 goes underneath the 200.

• What do we make in order to reduce this fraction?

• We make a T-chart.

• What do we do with the remaining factors?

• We multiply the remaining factor to get an answer.160 pages