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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 605 · 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. 1.483 + ? = 901
  2. 2.270 − ? = 18
  3. 3.A school has 930 children. 364 of them are girls. How many boys are there?
  4. 4.? − 572 = 192
  5. 5.? + 759 = 950
  6. 6.774 − ? = 266
  7. 7.532 − ? = 301
  8. 8.A train has 332 people in the front coaches and 616 people in the back coaches. How many people are on the train?
  9. 9.A school has 293 children. 169 of them are girls. How many boys are there?
  10. 10.111 + ? = 989
  11. 11.? − 310 = 131
  12. 12.A school has 398 children. 324 of them are girls. How many boys are there?
  13. 13.A school has 258 children. 135 of them are girls. How many boys are there?
  14. 14.535 + 305 =
  15. 15.? − 410 = 269
  16. 16.A train has 536 people in the front coaches and 367 people in the back coaches. How many people are on the train?
  17. 17.? − 209 = 109
  18. 18.785 + 128 =
  19. 19.593 + ? = 819
  20. 20.A train has 597 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  21. 21.683 − ? = 134
  22. 22.460 − ? = 111
  23. 23.A train has 405 people in the front coaches and 178 people in the back coaches. How many people are on the train?
  24. 24.699 − ? = 348
  25. 25.210 − 194 =
  26. 26.320 − ? = 215
  27. 27.A school has 615 children. 467 of them are girls. How many boys are there?
  28. 28.276 + 587 =
  29. 29.440 − 389 =
  30. 30.A train has 538 people in the front coaches and 315 people in the back coaches. How many people are on the train?
  31. 31.A train has 145 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  32. 32.869 − ? = 489
  33. 33.? − 120 = 580
  34. 34.432 + 406 =
  35. 35.687 − 678 =
  36. 36.393 − 129 =
  37. 37.A train has 782 people in the front coaches and 146 people in the back coaches. How many people are on the train?
  38. 38.139 + 760 =
  39. 39.202 − ? = 94
  40. 40.276 + 638 =

Answer key

  1. 418
  2. 252
  3. 566
  4. 764
  5. 191
  6. 508
  7. 231
  8. 948
  9. 124
  10. 878
  11. 441
  12. 74
  13. 123
  14. 840
  15. 679
  16. 903
  17. 318
  18. 913
  19. 226
  20. 739
  21. 549
  22. 349
  23. 583
  24. 351
  25. 16
  26. 105
  27. 148
  28. 863
  29. 51
  30. 853
  31. 250
  32. 380
  33. 700
  34. 838
  35. 9
  36. 264
  37. 928
  38. 899
  39. 108
  40. 914

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