Add and Subtract to 20

Add and Subtract to 20

Math review

Doubles plus 1

2+2+1=5

Multiple Choice

What doubles would you use to solve 9+8?

• 5+5

• 8+8

• 9+9

Multiple Choice

What double would you use to solve 7+8?

• 9+9

• 8+8

• 7+7

Vocabulary

sum, difference , equal, equation,

Multiple Choice

The sum is the

• how many you have in all

• a number sentence

• what goes away

Multiple Choice

What does the word equal mean?

• put it together

• take away

• same amount

Multiple Choice

What is an equation ?

• what you have in all

• a number sentence

• what is left over

Are two equations equal?

2+4=4+1

Multiple Choice

9+1 is equal to 5+5?

• true

• false

Multiple Choice

8+3 is equal to 5+7?

• true

• false

Fact families

2+1= 3

1+2=3

3-1=2

3-2=1

Multiple Choice

Which of the equations below are in the same fact family as

10-8=2

• 2+9

• 8-4

• 8+2

Multiple Choice

This is a fact family.

5+2=7

2+5=7

7-2=5

7-5=2

• true

• false

Find the equation that is equal

1+1=2+0

Multiple Choice

7+3=10

• 2+7

• 8+2

• 4+4

Multiple Choice

11+3=14

• 9+1

• 8+3

• 7+7