Addition · US · Grades 1–3

3rd Grade Addition Worksheets (3-Digit)

Thirty three-digit addition problems with regrouping in some columns and not in others — fluency within 1000 as grade 3 defines it. Thirty problems is a 10-minute sheet; the answer key is on page 2.

Problems: 30 · 3-Digit Addition
Regrouping: some regroup
Answer key: Included, same positions
Paper size: US Letter (A4 available)

About this worksheet

For a harder version, move to four-digit numbers (grade 4). For students still working on the carry itself, the 3-digit with regrouping sheet forces it on every problem.

Standards

Common Core 3.NBT.A.2 — fluently add and subtract within 1000
Common Core 4.NBT.B.4 (next step)

Questions

How fast should a third grader add three-digit numbers?

Fluency means accurate and efficient with a written method, not timed recall. Thirty problems in about 10 minutes with 90% accuracy is a reasonable mid-year benchmark.

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