Addition worksheet: hard
Two three-digit numbers, such as 347 + 286. Add the hundreds, tens and ones separately, then combine the three totals.
20 questions on the first page, the answer key on the second. Fits A4 and US Letter.
Addition worksheet
Hard · 20 questions
NameDateScore/ 20
- 574 + 252 =
- 592 + 255 =
- 325 + 360 =
- 571 + 544 =
- 435 + 359 =
- 539 + 579 =
- 130 + 397 =
- 291 + 495 =
- 443 + 574 =
- 835 + 105 =
- 193 + 400 =
- 743 + 179 =
- 212 + 493 =
- 719 + 172 =
- 613 + 366 =
- 765 + 639 =
- 239 + 355 =
- 517 + 786 =
- 147 + 276 =
- 188 + 198 =
iwanttobegoodatmath.com/worksheets/ · Addition, hard, 20 questions, sheet code print1
Answer key
Addition worksheet
- 574 + 252 = 826
- 592 + 255 = 847
- 325 + 360 = 685
- 571 + 544 = 1115
- 435 + 359 = 794
- 539 + 579 = 1118
- 130 + 397 = 527
- 291 + 495 = 786
- 443 + 574 = 1017
- 835 + 105 = 940
- 193 + 400 = 593
- 743 + 179 = 922
- 212 + 493 = 705
- 719 + 172 = 891
- 613 + 366 = 979
- 765 + 639 = 1404
- 239 + 355 = 594
- 517 + 786 = 1303
- 147 + 276 = 423
- 188 + 198 = 386
iwanttobegoodatmath.com/worksheets/ · Addition, hard, 20 questions, sheet code print1
About this worksheet
Two three-digit numbers, such as 347 + 286. Add the hundreds, tens and ones separately, then combine the three totals. All answers are whole numbers, and no question appears twice. This page always shows the same sample sheet; the worksheet generator makes a new one each time, with 10, 20 or 30 questions.
If this is a stretch, the medium addition worksheet uses smaller numbers. To practise on screen with an explanation after each answer, use the mental addition practice set.