Doubles +1
Addition and Subtract Mental strategies
One step one problems
100

What double can I use to find the answer 14

7+7=

100

What is 16-5=

Show work 

11

100

The Diaz family has 18 eggs. They eat some eggs for breakfast. Now they have 12 eggs How many eggs did the Diaz family eat?

18-12=6 eggs

200

Willie makes 6 cards for his family. He makes 9 cards for his friend. How many cards does Willie make in all?

15

200

Ana wants to find 13-8

Which equation can she use to make a ten to solve the problem?

13-3=10

10-5=5


13-3=10

10-8=2


8+2=10

13-10=3

13-3=10

10-5=5

200

Hana sees 3 green birds. She also sees some yellow birds. Hanna sees 12 birds in all. How many yellow birds does Hana see?

3 green birds

? yellow birds

12 birds in all

3+?=12

12-3=9

3+9=12

ANSWER IS 9

300

What is 5+6= 

Show your work?

5+5+1=

300

What are the fact family for 15=9+6

Give me all the three answers

15-6=9

15-9=6

6+9=15

300

6 toy trucks+? toy trucks =11 toy trucks

5 toy trucks

400

Find 6+9 Decide if each equation shows how to make a ten to find the sum

Choose Yes or No for each equation 

6+6+3=?

5+1+9=?

3+3+9=

No

yes

No

400

Find 14-6 by counting on show your work

7,8,9,10,11,12,13,14

14-6=8

400

Carlos has 15 crayons. He gives 7 crayons to his friend. How many crayons does Carlos have left?

 15 − 7 = 8

500

7+8= 

Which of the following can be used to find 7+8= 

Write all the correct answers

7+7+1

7+3+5

10+5

500

Use a base ten to find 18-9

9

500

: Noah has 16 toy cars. He gives some away. Now he has 9 toy cars. How many did he give away?

16 − ___ = 9 

Answer is 7

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