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Three-digit addition worksheets

Twenty three-digit addition problems, with and without carrying, stacked in three versions with keys. Totals go up to 1,000.

Addition: within 1,000 (three-digit)

NameDate

Add.

Sheet AFree at teach.peabody.kids

Addition: within 1,000 (three-digit)

NameDate

Add.

Sheet BFree at teach.peabody.kids

Addition: within 1,000 (three-digit)

NameDate

Add.

Sheet CFree at teach.peabody.kids

Answer key

Sheet A

  1. 991
  2. 884
  3. 936
  4. 540
  5. 856
  6. 747
  7. 931
  8. 829
  9. 647
  10. 982
  11. 578
  12. 940
  13. 903
  14. 991
  15. 705
  16. 699
  17. 961
  18. 912
  19. 986
  20. 887

Sheet B

  1. 848
  2. 773
  3. 690
  4. 914
  5. 919
  6. 333
  7. 987
  8. 622
  9. 461
  10. 953
  11. 735
  12. 801
  13. 808
  14. 439
  15. 989
  16. 893
  17. 993
  18. 945
  19. 976
  20. 937

Sheet C

  1. 1,000
  2. 605
  3. 981
  4. 748
  5. 720
  6. 944
  7. 806
  8. 648
  9. 743
  10. 993
  11. 947
  12. 944
  13. 542
  14. 735
  15. 565
  16. 933
  17. 579
  18. 979
  19. 611
  20. 936
Answer keyFree at teach.peabody.kids

Addition: 20 problems a sheet, 3 versions that do not repeat each other where the numbers allow.

How to use it

  1. Look at the sheet: it is a real, printable sheet. Switch between Sheet A, B and C, or press New numbers (N) for a fresh set.
  2. Change how many problems, how many versions, and whether the key prints. Settings stay in this browser; Share copies a link that rebuilds the same sheets.
  3. Press Print sheet A and key, or Print all. The answer key prints on its own page, so you can keep it back.

Ideas for class

  • Ask for an estimate to the nearest hundred before the exact answer, and teach students to compare the two.
  • Print the three versions as a Monday-Wednesday-Friday set and mark only the number correct on the last, so students can see growth.
  • For students who struggle, set Regrouping to Never regroup in the maker to rebuild the column habit.

Related

Questions

What is the largest total?

The two numbers are chosen so that their sum is at most 1,000, so no answer needs more than four digits and most need three. For larger totals, use the four-digit addition sheet in the maker.

Can I get only problems that carry?

Open the sheet in the maker, choose Addition, Within 1,000, and set Regrouping to Always regroup.

Are the answer keys checked?

Each answer is worked out by the code that wrote the problem, and our tests recompute every answer a second way and compare. Please still look over the key before you grade a class set.

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What this worksheet covers

Adding three-digit numbers extends two-digit addition by one column, with the chance to carry from the ones to the tens, from the tens to the hundreds, or both. This sheet mixes problems with no carry, one carry and two carries, so students practice choosing what each column needs. The numbers are chosen so that no total is more than 1,000.

Who it is for

Second graders add within 1,000 under Common Core 2.NBT.B.7, and third graders are expected to do it fluently under 3.NBT.A.2. Use it for review in the fall of third grade, or as an assessment sheet at the end of a unit.

Adding three-digit numbers, with and without carrying · grades 2 and 3

A worked example

Add 358 and 267. Ones: 8 + 7 = 15, write 5 carry 1. Tens: 5 + 6 + 1 = 12, write 2 carry 1. Hundreds: 3 + 2 + 1 = 6. The answer is 625. Estimate first: 360 + 270 is about 630.

Mistakes to watch for

  • Carrying into the wrong column or writing both digits in one place. Rule columns with a pencil line before starting.
  • Skipping the carried amount in the last column, so the hundreds come out one short. Estimating catches it.

Make it your own

This sheet is one setting of the math worksheet generator. Open it there to change the skill, the range of numbers or the heading, or to mix several skills on one sheet.