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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 31 · 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. 1.611 − 484 =
  2. 2.? − 130 = 636
  3. 3.854 − 111 =
  4. 4.A train has 131 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  5. 5.853 + ? = 958
  6. 6.? + 185 = 895
  7. 7.? + 890 = 991
  8. 8.A train has 128 people in the front coaches and 552 people in the back coaches. How many people are on the train?
  9. 9.A train has 379 people in the front coaches and 525 people in the back coaches. How many people are on the train?
  10. 10.352 − 120 =
  11. 11.678 − 455 =
  12. 12.A school has 966 children. 112 of them are girls. How many boys are there?
  13. 13.433 − 358 =
  14. 14.A school has 294 children. 201 of them are girls. How many boys are there?
  15. 15.409 − 215 =
  16. 16.885 − 503 =
  17. 17.A school has 396 children. 319 of them are girls. How many boys are there?
  18. 18.? − 345 = 163
  19. 19.202 + 771 =
  20. 20.A train has 568 people in the front coaches and 375 people in the back coaches. How many people are on the train?
  21. 21.A school has 324 children. 213 of them are girls. How many boys are there?
  22. 22.336 + 238 =
  23. 23.A school has 669 children. 119 of them are girls. How many boys are there?
  24. 24.? − 160 = 663
  25. 25.A train has 334 people in the front coaches and 608 people in the back coaches. How many people are on the train?
  26. 26.184 + 708 =
  27. 27.A school has 334 children. 221 of them are girls. How many boys are there?
  28. 28.A school has 504 children. 379 of them are girls. How many boys are there?
  29. 29.342 + 107 =
  30. 30.556 − 152 =
  31. 31.A school has 491 children. 202 of them are girls. How many boys are there?
  32. 32.712 − 615 =
  33. 33.953 − 727 =
  34. 34.870 − ? = 209
  35. 35.? + 112 = 262
  36. 36.736 + 221 =
  37. 37.502 + 326 =
  38. 38.841 − ? = 242
  39. 39.A school has 613 children. 442 of them are girls. How many boys are there?
  40. 40.525 − ? = 307

Answer key

  1. 127
  2. 766
  3. 743
  4. 235
  5. 105
  6. 710
  7. 101
  8. 680
  9. 904
  10. 232
  11. 223
  12. 854
  13. 75
  14. 93
  15. 194
  16. 382
  17. 77
  18. 508
  19. 973
  20. 943
  21. 111
  22. 574
  23. 550
  24. 823
  25. 942
  26. 892
  27. 113
  28. 125
  29. 449
  30. 404
  31. 289
  32. 97
  33. 226
  34. 661
  35. 150
  36. 957
  37. 828
  38. 599
  39. 171
  40. 218

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