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Addition Within 1,000
Grade 3 - Math - Building Confidence
Worksheet 1
1What is 173 + 156?
2Which equation matches 134 + 51?
3A school has 251 pencils and 105 more pencils. How many pencils are there in all?
4Estimate first, then choose the exact result for 167 + 170.
5Which place-value statement helps add 268 and 221?
6What is 371 + 90?
7Which equation matches 238 + 119?
8A school has 282 pencils and 143 more pencils. How many pencils are there in all?
9Estimate first, then choose the exact result for 395 + 34.
10Which place-value statement helps add 415 and 38?
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