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Adding Within 1000

Practice adding three-digit numbers with this worksheet designed for third graders.

Grade 3 Math AdditionAdding Within 1000
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Includes

2 Short AnswerFill in the BlanksMultiple ChoiceTrue / FalseCustom

Standards

CCSS.MATH.CONTENT.3.NBT.A.2

Topics

mathadditionthird gradenumber sense
8 sections · Free to use · Printable
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Adding Within 1000

Name:

Date:

Score:

Read each question carefully and solve the addition problems. Show your work when necessary.

Solve the following addition problems:

1. 345 + 123 =

2. 567 + 231 =

3. 189 + 456 =

4. 205 + 398 =

Fill in the missing numbers to complete the addition sentences.

5. 420 +   = 650

6.   + 150 = 375

7. 710 + 200 =  

8. Which sum is correct for 299 + 301?

a

500

b

600

c

601

d

700

Read each statement and circle True or False.

9. The sum of 450 and 350 is 800.

T

True

F

False

10. Adding 1 to any number always makes it larger.

T

True

F

False

11. Use the number line to show how to add 200 + 150. Start at 200 and draw a jump for 150.

0100200300400500

The sum is:  

12. Sarah read 175 pages last week and 210 pages this week. How many pages did she read in total?