Addition and Subtraction Strategies

Vocabulary

100

The symbol in this addition number sentence:

6 + 7

plus sign

200

When you have a number and you add the same number to itself, that is called a ______ fact.

doubles

300

The property of addition that says "When you add 0 to any number, the number stays the same."

identity property

400

The answer to an addition problem is the _____.

The answer to a subtraction problem is the ___________. 

sum

difference

500

The two numbers you add together are called parts, or ____________.

addends

Counting and Doubling

100

3 + 8 =

11

200

13 - 6 =

7

300

7 + 3 =

10

400

5 + 7 + 5 =

Explain how you can use doubles to solve this. 

Solve 5 + 5 = 10. Then 10 + 7 = 17. The sum is 17. 

500

6 + 3 + 7 =

What strategy do you use to solve?

Friends of 10. 

7 + 3 = 10

10 + 6 = 16

Flip Flop

100

Turn this number sentence around and solve:

5 + 9 =

9 + 5 =14

200

8 + ____ = 13

13 - 8 = 5

300

If 6 + 6 = 12

12 - 6 = ____

6

400

14 - 7 =

Solve. Explain how you know using an addition fact. 

7 + 7 = 14

14- 7 =7

500

Write a subtraction fact that matches this addition fact. 

3 + 9 = 12

12 - 9 = 3

12 - 3 = 9

Fact Fam

100

Using these numbers, what are the number sentences in this fact family:

8, 12, 4

8 + 4 = 12

4 + 8 = 12

12 - 8 =4

12 - 4 = 8

200

2, 9, 11

What is the fact family? What are the related facts?

11 is the top, 2 and 9 are the parts

2 + 9 = 11

9 + 2 = 11

11 - 2 = 9

11 - 9 = 2

300

I know 12 - 8 = ___.

So 8 + ___ = 12

4

400

Solve this: 11 - 5 = ___. 

Now, write the "flip flop" fact:

____ - ____ = ____

6

11 - 6 = 5

500

Write the fact family triangle for this:

13 - ____ = 7

13 - 7 = ____

7 + ____ = 13

____ + 7 = 13

13

7

6

Word Probs

100

Jim scored 3 goals at his soccer game on Saturday. On Sunday he scored 6 goals. How many goals did he score in all? Write a number sentence and solve. 

3  + 6 = 9

9 goals

200

Bill had 8 toys. His sister broke 2. How many are left? Show your work.

6

300

Amy had 5 dolls. She got 4 more for her birthday. How many does she have in all?

9

400

Kevin has 8 toy cars. Ben has 6 toy cars. Alexa has 3 toy cars. How many do they have all together? Show a number sentence. 

8 + 6 + 3 = 17

500

Sam had 8 lollipops. He got 5 more. Then he gave 4 lollipops away. How many does Sam have now? Show your work. 

8 + 5 = 13

13 - 4 = 9

9 lollipops