Unit 3 Solve Problems Within 20 Review

Look at the equation.

8 + ? + 4 = 19

Frogs are gathering in a pond. Which picture below makes this equation true?

• 
• 
• 
• 

Read the word problem.

A girl picked roses for her mother. She picked an unknown number of red roses, 2 white roses and 9 yellow roses. She picked 15 roses altogether.

Which equation below best represents the word problem?

• ? + 2 + 9 = 15

  2 + 2 + 9 = 15

• ? + 2 + 9 = 15

  4 + 2 + 9 = 15

• ? + 2 + 9 = 15

  3 + 2 + 9 = 15

• ? + 2 + 9 = 15

  7 + 2 + 9 = 15

Which equation is true?

• 5 = 9 - 2

• 14 = 6 + 8

• 11 = 5 + 3

• 18 = 15 + 3

Which equation is false?

• 5 + 4 = 2 + 7

• 10 + 3 = 2 + 11

• 2 + 4 = 14 - 8

• 17 - 8 = 4 + 4

Which equation is true?

• 9 = 13 + 2

• 15 = 20 - 5

• 19 = 15 + 6

• 20 = 12 + 7

The sum is 8. Which expression is NOT equal to 8?

• 5+3

• 2+6

• 4+5

• 7+1

Look at the equation.

9 + ? = 16

What number is missing from the equation?

• 6

• 4

• 7

• 5

Look at the equation.

16 - ? = 8

What number is missing from the equation?

• 12

• 8

• 11

• 7

Which expression has a sum of 13?

• 7+4

• 8+5

• 12+2

• 9+5

What is the sum of 5 + 6?

• 13

• 9

• 11

• 15