Lesson 9 iReady Review

Word Problems

100

There are 5 groups of 20 students in the library. Each student checked out 2 books. How many total books are checked out of the library?

200 books

200

Two friends are collecting toy cars. Both friends have 3 boxes with 30 cars in each box. How many toy cars are there in all?

180 cars

300

Mrs. Crayola has 6 boxes of markers with 40 markers in each box. How many markers does she have in all? 

240 markers

400

An aquarium has 8 tanks in a room. Each tank holds 20 fish. How many fish are there in all?

160 fish.

500

Rachel is planting a garden. He plants 50 seeds in each row of the garden. How many seeds will be plant in 6 rows?

300 seeds

Multiplying 1

100

5 x 20

100

200

8 x 40

320

300

3 x 40

120

400

7 x 50

350

500

8 x 20

160

Multiplying 2

100

6 x 30

180

200

2 x 70

140

300

9 x 60

540

400

4 x 70

280

500

2 x 60

120

Another Way to Write It

100

Another way to write 6 x 30, using parentheses:

6 x (3 x 10) 

(6 x 3) x 10

200

Another way to write 7 x 30, using parentheses: 

7 x (3 x 10)

(7 x 3) x 10

300

Another way to write 4 x 20, using parentheses:

4 x (2 x 10)

(4 x 2) x 10

400

Another way to write 3 x 50, using parentheses:

3 x (5 x 10) 

(3 x 5) x 10

500

Another way to write 4 x 40, using parentheses:

4 x (4 x 10)

(4 x 4) x 10

Does it equal?

100

Which of the following equations equals 120? 

4 x 20

4 x 30

6 x 30

4 x 30

200

Which of the following equations equals 150?

5 x 30

1 x 90

3 x 60

5 x 30

300

Which of the following equations equals 300?

7 x 30

5 x 50

5 x 60

5 x 60

400

Which of the following equations equals 240?

7 x 40

6 x 40

4 x 40

6 x 40

500

Which of the following equations equals 450? 

9 x 30

9 x 50

9 x 20

9 x 50