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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 697 · 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.? − 198 = 320
  2. 2.A school has 555 children. 197 of them are girls. How many boys are there?
  3. 3.? + 686 = 979
  4. 4.A school has 989 children. 313 of them are girls. How many boys are there?
  5. 5.412 + 368 =
  6. 6.603 + 134 =
  7. 7.301 + 148 =
  8. 8.800 + ? = 946
  9. 9.A school has 215 children. 122 of them are girls. How many boys are there?
  10. 10.410 − ? = 275
  11. 11.990 − ? = 782
  12. 12.? − 251 = 131
  13. 13.? − 559 = 284
  14. 14.? + 421 = 659
  15. 15.712 − 217 =
  16. 16.? + 121 = 712
  17. 17.382 − ? = 48
  18. 18.A train has 606 people in the front coaches and 256 people in the back coaches. How many people are on the train?
  19. 19.434 − ? = 184
  20. 20.A school has 975 children. 950 of them are girls. How many boys are there?
  21. 21.? + 344 = 550
  22. 22.A train has 392 people in the front coaches and 340 people in the back coaches. How many people are on the train?
  23. 23.? − 120 = 111
  24. 24.A school has 291 children. 250 of them are girls. How many boys are there?
  25. 25.298 − 233 =
  26. 26.271 − ? = 40
  27. 27.232 − ? = 78
  28. 28.223 − 155 =
  29. 29.373 − 307 =
  30. 30.785 − 233 =
  31. 31.561 − ? = 440
  32. 32.A school has 766 children. 189 of them are girls. How many boys are there?
  33. 33.? − 910 = 19
  34. 34.729 − ? = 67
  35. 35.825 − ? = 591
  36. 36.610 − 174 =
  37. 37.419 + 295 =
  38. 38.A school has 285 children. 270 of them are girls. How many boys are there?
  39. 39.? + 810 = 989
  40. 40.A train has 557 people in the front coaches and 284 people in the back coaches. How many people are on the train?

Answer key

  1. 518
  2. 358
  3. 293
  4. 676
  5. 780
  6. 737
  7. 449
  8. 146
  9. 93
  10. 135
  11. 208
  12. 382
  13. 843
  14. 238
  15. 495
  16. 591
  17. 334
  18. 862
  19. 250
  20. 25
  21. 206
  22. 732
  23. 231
  24. 41
  25. 65
  26. 231
  27. 154
  28. 68
  29. 66
  30. 552
  31. 121
  32. 577
  33. 929
  34. 662
  35. 234
  36. 436
  37. 714
  38. 15
  39. 179
  40. 841

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