2nd Grade Fluently Add and Subtract within 20

Addition Facts

100

Count on to find the sum. Then, FLIP the addends to make a new equation.

2 + 4 = ____

2 + 4 = 6

4 + 2 = 6

200

Count on to find the sum. Then, FLIP the addends to make a new equation.

6 + 1 = ____

6 + 1 = 7

1 + 6 = 7

300

Count on to find the sum. Then, FLIP the addends to make a new equation.

7 + 2 = ____

7 + 2 = 9

2 + 7 = 9

400

Count on to find the sum. Then, FLIP the addends to make a new equation.

10 + 5 = ___

10 + 5 = 15

5 + 10 = 15

500

Count on to find the sum. Then, FLIP the addends to make a new equation.

12 + 5 = ____

12 + 5 = 17

5 + 12 = 17

Doubles and Near Doubles

100

Solve the doubles facts. Use the sums to solve the near doubles facts. 

2 + 2 = ___

2 + 3 = ___

2 + 2 =  4

2 + 3 = 5

200

Solve the doubles facts. Use the sums to solve the near doubles facts. 

5 + 5 = ___

5 + 6 = ___

5 + 5 = 10

5 + 6 = 11

300

Solve the doubles facts. Use the sums to solve the near doubles facts. 

4 + 4 = ___

4 + 5 = ___

4 + 4 = 8

4 + 5 = 9

400

Solve the doubles facts. Use the sums to solve the near doubles facts. 

7 + 7 = ___

7 + 8 = ___

7 + 7 = 14

7 + 8 = 15

500

Solve the doubles facts. Use the sums to solve the near doubles facts. 

8 + 8 = ___

8 + 9 = ___

8 + 8 = 16

8 + 9 = 17

Make a 10

100

Make a 10 to add.

8 + 6 = ?

10 + 4 = 14

So, 8 + 6 = 14

200

Make a 10 to add.

7 + 4

10 + 1 = 11

So, 7 + 4 = 11

300

Make a 10 to add.

9 + 3 = ?

10 + 2 = 12

So, 9 + 3 = 12

400

Make a 10 to add.

9 + 8 = ?

10 + 7 = 17

So, 9 + 8 = 17

500

Make a 10 to find 15 - 7.

15 - ___ = 10

10 - ___ = ___

15 - 7 = ____

Make a 10 to find 15 - 7.

15 - 5 = 10

10 - 3 = 7

15 -  = 8

Count On and Count Back

100

Use the number line to count back to solve:

15 - 4 = ____

15 - 4 = 11

200

Use the number line to count back to solve:

18 - 6 = ____

18 - 6 = 12

300

Use the number line to count back to solve:

11 - 7 = ____

11 - 7 = 4

400

Use the number line to count on to solve:

15 - 7 = ____

15 - 7 = 8

500

Use the number line to count on to solve:

12 - 3 = ____

12 - 3 = 9

Word Problems

100

There were 14 birds. 7 flew away. How many birds are left?

7

200

Patty had 8 seeds. She found 3 more seeds. How many seeds does she have altogether?

11

300

Jeff saw 16 red leaves and 5 yellow leaves. How many fewer yellow leaves did he see?

9

400

Tim read 9 books last week and 7 books this week. He says he read 16 books in all. Do you agree?  

Yes.

9 + 7 = 16

500

Fran had 14 cupcakes. She gave away 9 cupcakes. She says she has 4 left. Do you agree?

No.

14 - 9 = 5