Adding Within 1000
Practice adding three-digit numbers with this worksheet designed for third graders.
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Standards
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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?
500
600
601
700
Read each statement and circle True or False.
9. The sum of 450 and 350 is 800.
True
False
10. Adding 1 to any number always makes it larger.
True
False
11. Use the number line to show how to add 200 + 150. Start at 200 and draw a jump for 150.
The sum is:
12. Sarah read 175 pages last week and 210 pages this week. How many pages did she read in total?
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