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Addition Within 1,000
Grade 3 - Math - On Level
Worksheet 1
1What is 711 + 78?
2Which equation matches 711 + 32?
3A school has 307 pencils and 280 more pencils. How many pencils are there in all?
4Estimate first, then choose the exact result for 378 + 404.
5Which place-value statement helps add 574 and 41?
6What is 640 + 32?
7Which equation matches 653 + 47?
8A school has 176 pencils and 389 more pencils. How many pencils are there in all?
9Estimate first, then choose the exact result for 300 + 414.
10Which place-value statement helps add 449 and 254?
About this worksheet
Addition within one thousand extends the place-value habits children learned with two-digit numbers. Third graders must keep hundreds, tens, and ones aligned, and they often need to regroup across more than one place. A common error is adding digits in the order they are seen rather than by place. This worksheet uses word-form numbers to keep attention on place-value meaning while still asking students to compute exact sums. Items rotate through direct sums, equation matching, word problems, estimation checks, and place-value reasoning. Support versions use smaller sums and fewer regrouping cases. Standard and challenge versions include larger values and closer distractors. Encourage your child to estimate first, then calculate carefully, because an estimate catches many unreasonable answers before they become final.
What your child will learn
Add numbers within one thousand
Use place value to combine hundreds, tens, and ones
Interpret word problems
Check sums with estimation
Worked example
Two hundred forty plus one hundred thirty is three hundred seventy.
Common mistake
Adding digits without lining up place values.
Helpful hint
Line up hundreds, tens, and ones before calculating.
Worksheet 1