Addition and subtraction strategies to 20

Find the Sum/difference

100

2+6=

8

200

9+4=

13

300

8+4+6=

18

400

8+2+3=

13

500

18-9=

9

Turn-around facts

100

7+5=12

5+7=12

200

15-8=7

15-7=8

300

8+4=12

4+8=12

400

6+8=14

8-6=14

What are the 2 other facts in this fact family?

14-6=8

14-8=6

500

Fact Family

9, 3, 12

3+9=12

9+3=12

12-9=3

12-3=9

Doubles Facts

100

4+4=

8

200

5+5=

10

300

8+9=

17

400

Which Doubles fact can help you solve

4+5

5+5

4+4

500

Which doubles fact can help you solve 8+9

8+8

9+9

Make a 10 to add/subtract

100

5+6=

10+1

200

9+4=

10+3

300

9+7=

10+6

400

14-9=

10-5

500

11-5=______-4

10-4

Problem Solving

100

13 birds on a tree.  5 fly away. 6 more come.

How many birds now?

14

200

15 markers in a pencil case.  3 are green, 8 are red, the rest are blue.  How many are blue?

4

300

Some puppies are playing.  8 more join them.  Now there are 11.  How many puppies were there to start?

3

400

6 kids eat pizza.  15 kids eat soup.  4 kids eat mac and cheese.  How many students do not eat soup?

10

500

8 girls + 14 boys= ______ students.

22

2B is AWESOME!