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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 938 · 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.A train has 536 people in the front coaches and 430 people in the back coaches. How many people are on the train?
  2. 2.A school has 398 children. 156 of them are girls. How many boys are there?
  3. 3.A school has 201 children. 147 of them are girls. How many boys are there?
  4. 4.A school has 930 children. 332 of them are girls. How many boys are there?
  5. 5.? − 737 = 260
  6. 6.543 + ? = 838
  7. 7.A school has 987 children. 777 of them are girls. How many boys are there?
  8. 8.? + 532 = 810
  9. 9.A train has 510 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  10. 10.761 + 198 =
  11. 11.399 − 128 =
  12. 12.185 + ? = 934
  13. 13.691 − 298 =
  14. 14.? − 322 = 277
  15. 15.135 + 358 =
  16. 16.A school has 375 children. 112 of them are girls. How many boys are there?
  17. 17.A school has 617 children. 169 of them are girls. How many boys are there?
  18. 18.957 − 664 =
  19. 19.406 − ? = 167
  20. 20.? + 327 = 794
  21. 21.A school has 263 children. 224 of them are girls. How many boys are there?
  22. 22.329 − 100 =
  23. 23.A school has 306 children. 226 of them are girls. How many boys are there?
  24. 24.? − 221 = 214
  25. 25.669 + ? = 987
  26. 26.379 − 179 =
  27. 27.680 + 312 =
  28. 28.? − 138 = 680
  29. 29.490 + 142 =
  30. 30.? + 603 = 799
  31. 31.292 + ? = 795
  32. 32.492 + ? = 899
  33. 33.300 + 274 =
  34. 34.230 − ? = 44
  35. 35.269 + ? = 716
  36. 36.? − 490 = 114
  37. 37.? − 179 = 67
  38. 38.A school has 779 children. 697 of them are girls. How many boys are there?
  39. 39.541 + ? = 825
  40. 40.632 + 171 =

Answer key

  1. 966
  2. 242
  3. 54
  4. 598
  5. 997
  6. 295
  7. 210
  8. 278
  9. 623
  10. 959
  11. 271
  12. 749
  13. 393
  14. 599
  15. 493
  16. 263
  17. 448
  18. 293
  19. 239
  20. 467
  21. 39
  22. 229
  23. 80
  24. 435
  25. 318
  26. 200
  27. 992
  28. 818
  29. 632
  30. 196
  31. 503
  32. 407
  33. 574
  34. 186
  35. 447
  36. 604
  37. 246
  38. 82
  39. 284
  40. 803

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