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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 143 · 40 sums
TalentJR

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

NameDateTime takenScore ___ / 40
  1. 1.508 + 101 =
  2. 2.A train has 383 people in the front coaches and 611 people in the back coaches. How many people are on the train?
  3. 3.A school has 669 children. 444 of them are girls. How many boys are there?
  4. 4.? + 140 = 896
  5. 5.357 + ? = 596
  6. 6.A school has 905 children. 471 of them are girls. How many boys are there?
  7. 7.A school has 996 children. 116 of them are girls. How many boys are there?
  8. 8.A train has 119 people in the front coaches and 661 people in the back coaches. How many people are on the train?
  9. 9.661 − 370 =
  10. 10.159 + 622 =
  11. 11.994 − 168 =
  12. 12.804 + ? = 995
  13. 13.354 − 189 =
  14. 14.A train has 448 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  15. 15.? − 256 = 147
  16. 16.A train has 373 people in the front coaches and 229 people in the back coaches. How many people are on the train?
  17. 17.722 + 160 =
  18. 18.565 − ? = 298
  19. 19.A school has 461 children. 441 of them are girls. How many boys are there?
  20. 20.168 + ? = 410
  21. 21.406 + 442 =
  22. 22.374 − 153 =
  23. 23.A school has 817 children. 264 of them are girls. How many boys are there?
  24. 24.325 − 147 =
  25. 25.A school has 378 children. 287 of them are girls. How many boys are there?
  26. 26.A school has 566 children. 273 of them are girls. How many boys are there?
  27. 27.A train has 228 people in the front coaches and 656 people in the back coaches. How many people are on the train?
  28. 28.619 − 260 =
  29. 29.A school has 673 children. 285 of them are girls. How many boys are there?
  30. 30.? + 584 = 794
  31. 31.779 − 240 =
  32. 32.770 + ? = 987
  33. 33.474 − 156 =
  34. 34.? − 325 = 149
  35. 35.321 + 281 =
  36. 36.? + 759 = 881
  37. 37.397 + 567 =
  38. 38.240 + ? = 660
  39. 39.A train has 857 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  40. 40.A train has 523 people in the front coaches and 247 people in the back coaches. How many people are on the train?

Answer key

  1. 609
  2. 994
  3. 225
  4. 756
  5. 239
  6. 434
  7. 880
  8. 780
  9. 291
  10. 781
  11. 826
  12. 191
  13. 165
  14. 551
  15. 403
  16. 602
  17. 882
  18. 267
  19. 20
  20. 242
  21. 848
  22. 221
  23. 553
  24. 178
  25. 91
  26. 293
  27. 884
  28. 359
  29. 388
  30. 210
  31. 539
  32. 217
  33. 318
  34. 474
  35. 602
  36. 122
  37. 964
  38. 420
  39. 973
  40. 770

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