Unit 5 Review

Which number sentence is true?

• 1 + 9 = 9 - 1

• 8 - 1 = 7 + 1

• 21 = 13 + 8

• 6 + 1 = 2 + 4

Choose the number sentence that shows the difference.

• 5 + 6 = 11

• 7 - 3

• 6 - 4 = 1 + 1

• 12 - 7 = 5

Choose the number sentence that shows the sum.

• 8 + 2 = 15 - 5

• 6 + 7 = 13

• 4 + 12

• 14 - 4 = 10

Which is true?

• 14 = 6 + 7

• 7 - 5 = 9 - 6

• 6 + 2 = 2 + 8

• 13 - 8 = 7 - 2

Look at the picture. How many fewer plates are there than cups? Choose the number.

• 8 fewer plates

• 5 fewer plates

• 3 fewer plates

• 2 fewer plates

Which is the unknown numbers in these related facts?

• 1

• 3

• 8

• 9

Look at the number sentences. What number is missing? Choose the number

• 4

• 5

• 6

• 7

There are 5 hippos in the lake. Some more hippos come. Now there are 12 hippos. How many hippos come to the lake?

• 5 hippos

• 6 hippos

• 7 hippos

• 8 hippos

There are 17 birds in a tree. Some birds fly away. There are 8 birds left in the tree. How many birds fly away?

• 8

• 9

• 10

• 11

5 monkeys climb up a tree. Now 12 monkeys are in the tree. How many monkeys were in the tree to start?

• 7

• 8

• 9

• 10