3-Digit Addition Without Regrouping Worksheets

Three-digit addition without regrouping extends the column method to the hundreds place. It is a short, confidence-building step before regrouping across two columns.

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Sheet code DUICEW
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3-Digit Addition

Score / 25

Add.

1.147+721
2.210+235
3.301+678
4.422+415
5.415+373
6.210+313
7.412+584
8.502+101
9.100+359
10.141+718
11.533+241
12.440+200
13.101+413
14.433+305
15.235+760
16.351+622
17.273+106
18.521+311
19.480+311
20.434+204
21.516+380
22.533+240
23.670+228
24.112+434
25.135+422
endlessmathsheets.comSheet DUICEW

Answer key3-Digit Addition

Add.

1.147+721868
2.210+235445
3.301+678979
4.422+415837
5.415+373788
6.210+313523
7.412+584996
8.502+101603
9.100+359459
10.141+718859
11.533+241774
12.440+200640
13.101+413514
14.433+305738
15.235+760995
16.351+622973
17.273+106379
18.521+311832
19.480+311791
20.434+204638
21.516+380896
22.533+240773
23.670+228898
24.112+434546
25.135+422557
endlessmathsheets.comSheet DUICEW

What's on this worksheet

Two three-digit numbers where no column adds up to 10 or more. Each sheet comes with an answer key on a separate page.

Teaching tips

  • Label the columns H, T and O at the top of the first few sheets.
  • Ask students to read each answer aloud as a number ("five hundred sixty-eight") to keep place value in view.

How to use this worksheet maker

Press New worksheet for a fresh set of problems, then Print. To save a PDF instead, choose "Save as PDF" in the print window. Every sheet has a short code in the bottom corner. Copy the link to a sheet and you can print exactly the same problems again later, which is handy for retakes and for sharing with other teachers.

Common Core alignment: 2.NBT.B.7 (Grade 2).