3-Digit Addition Worksheet — Free Printable PDF
A free printable 3-digit addition worksheet with regrouping — 40 column problems within 1,000, with a complete answer key on page 2. Ideal for third-grade fluency practice.
PDF · 2 pages · worksheet + answer key
What’s on this worksheet
Forty three-digit-plus-three-digit problems in vertical form, each requiring at least one carry across the ones, tens or hundreds. Several sums cross into the thousands, so children practise carrying all the way through. The page-2 key lists every answer.
How to use it
Encourage your child to add one column at a time, right to left, carrying whenever a column reaches ten. Circling any problems they hesitated on makes it easy to spot which place values still need work.
Aligned to Common Core (3.NBT.A.2)
This worksheet supports Common Core 3.NBT.A.2, in which third graders fluently add and subtract within 1,000 using strategies and algorithms based on place value. It is the natural step up from 2-digit carrying.
Prefer to practise on screen first? Try the free 3-digit addition practice — tap or type answers with instant feedback, then print this worksheet to lock it in off-screen.
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Frequently asked questions
Is this 3-digit addition worksheet free?
Yes — the PDF is free to download and print, with no account, for home or classroom use.
Do the problems use regrouping?
Yes, every problem needs carrying at least once, and many carry through more than one column.
Does it come with an answer key?
Yes, page 2 is a full answer key for self-checking and grading.
What grade is 3-digit addition for?
It is a 3rd grade skill (Common Core 3.NBT.A.2), also handy for 4th grade review.
How many problems are there?
Forty vertical addition problems — a solid ten-minute drill.