Grade 3 · Year 4 · Class 3 · ages 8–9

3-digit addition worksheets.

Free printable 3-digit addition worksheets with answer keys. Adding three-digit numbers, with carrying across tens and hundreds. Choose the level and the number of questions, then download a PDF or print.

Grade 3
Year 4 · Class 3
Ages 8–9
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Answer key
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Sheet 2106. Change the options above or make a new worksheet.

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3-digit addition

Grade 3 · Medium · 12 questions · Sheet 2106

Name Date Score / 12

1.897+102
2.177+344
3.205+767
4.182+629
5.644+204
6.135+789
7.818+124
8.684+270
9.413+305
10.394+476
11.323+450
12.437+109

About 3-digit addition worksheets

Adding three-digit numbers, with carrying across tens and hundreds. This worksheet maker is aimed at Grade 3 (Year 4, Class 3) (ages 8–9) and makes new questions every time, with the answers worked out by a maths engine.

Teaching tip

Add the ones, then the tens, then the hundreds, carrying each time a column reaches 10.

What the three levels look like

Easy: 339 + 147 =
Medium: 346 + 353 =
Challenge: 107 + 736 =

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FAQ

3-digit addition worksheets: questions

What grade are 3-digit addition worksheets for?

3-digit addition is usually taught around Grade 3 (Year 4, Class 3), for ages 8–9. Every grade has an easy, medium and challenge level, so you can go back to an earlier level or push ahead.

Do these 3-digit addition worksheets include an answer key?

Yes. Press Download PDF with the answer key switched on and the last page lists every answer. Turn the key off for a clean student copy.

Can I make a new worksheet with different questions?

Yes. Press New worksheet for a fresh set of questions. Each sheet has a sheet number printed on it; open this page with the same level, question count and number to get exactly the same sheet again.

How do I help a child who finds 3-digit addition hard?

Add the ones, then the tens, then the hundreds, carrying each time a column reaches 10. Start with the easy level, and practise a few minutes every day rather than one long session.

What is the best way to practise addition?

Short, frequent practice works best. Start with number bonds to 10, then bridging through 10, then column addition. Five to ten minutes a day is better than one long session.

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