Topic 1 Math Review

What problem is shown by the equal groups?

• 6 x 10 = 60

• 7 x 3 = 10

• 7 x 3 = 21

• 3 x 5 = 15

Answer explanation

There are 7 circles, or groups. Each group has 3 dots. So, we have 7 groups of 3 or 7 x 3. If we count the total number of dots, there are 21.

7 x 3 = 21

What multiplication sentence is shown by the repeated addition sentence

• 9 + 3 = 12

• 9 x 9 = 18

• 3 x 3 = 9

• 3 x 9 = 27

Answer explanation

The number 9 is added 3 times. That is 3 groups of 9, or 3 x 9. The sum of 9 + 9 + 9 is 27.

3 x 9 = 27

What multiplication sentence does the array show?

• 9 x 3 = 27

• 3 x 3 = 9

• 64 x 2 = 32

• 3 x 5 =15

Answer explanation

This array has 3 rows. There are 3 pentagons in each row. That is 3 rows of 3 or 3 x 3. There are 9 pentagons total.

3 x 3 = 9

Megan is decorating 9 picture frames. She needs 5 inches of ribbon for each frame. How many inches of ribbon does Megan need?

• 45 inches

• 9 inches

• 50 inches

• 36 inches

Answer explanation

What multiplication sentence is shown by the equal groups?

• 2 x 8 = 16

• 3 x 4 = 12

• 2 x 8 = 24

• 4 x 3 = 12

Answer explanation

There are 2 circles, or groups. Each group has 8 dots. That is 2 groups of 8, or 2 x 8. There are 16 dots total.

2 x 8 = 16

What multiplication sentence is shown by the repeated addition sentence?

• 6 x 6 = 36

• 2 x 2 = 4

• 2 x 6 = 12

• 6 + 2 = 8

Answer explanation

The number 6 is added 2 times. That is the same as 2 groups of 6, or 2 x 6. The sum of 6 + 6 is 12.

2 x 6 = 12

What multiplication sentence is shown by the array?

• 4 x 4 = 8

• 2 x 6 = 12

• 10 + 10 = 20

• 2 x 4 = 8

Answer explanation

This array has 2 rows with 4 hearts in each row. That is 2 groups of 4, or 2 x 4. There are 8 hearts total.

2 x 4 = 8

Murphy keeps birds as pets. He has 3 gigantic bird cages. 6 birds live in each cage. How many pet birds does Murphy have?

• 9 birds

• 24 birds

• 30 birds

• 18 birds

Answer explanation

What multiplication sentence is shown by the repeated addition problem?

• 10 x 10 = 100

• 10 + 10 + 10 = 30

• 4 x 10 = 40

• 10 + 4 = 14

Answer explanation

The number 10 is added 4 times. That is 4 groups of 10, or 4 x 10. The sum of 10 + 10 + 10 + 10 is 40.

4 x 10 = 40

What multiplication sentence is shown by the array?

• 8 x 4 = 32

• 5 x 5 = 25

• 8 x 5 = 40

• 8 + 8 = 16

Answer explanation

This array has 8 rows. There are 4 squares in each row. That is 8 groups of 4, or 8 x 4. There are 32 squares total.

8 x 4 = 32