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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 786 · 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 school has 338 children. 253 of them are girls. How many boys are there?
  2. 2.431 + 306 =
  3. 3.A school has 782 children. 728 of them are girls. How many boys are there?
  4. 4.? − 596 = 250
  5. 5.394 − 383 =
  6. 6.A school has 786 children. 580 of them are girls. How many boys are there?
  7. 7.A school has 442 children. 138 of them are girls. How many boys are there?
  8. 8.A train has 401 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  9. 9.167 + 243 =
  10. 10.A train has 606 people in the front coaches and 294 people in the back coaches. How many people are on the train?
  11. 11.A school has 220 children. 121 of them are girls. How many boys are there?
  12. 12.330 + 512 =
  13. 13.206 + 254 =
  14. 14.167 + 793 =
  15. 15.A school has 421 children. 372 of them are girls. How many boys are there?
  16. 16.454 + 423 =
  17. 17.641 − 362 =
  18. 18.A train has 582 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  19. 19.630 − ? = 89
  20. 20.A school has 517 children. 503 of them are girls. How many boys are there?
  21. 21.563 − ? = 151
  22. 22.? + 363 = 793
  23. 23.? + 634 = 755
  24. 24.511 − ? = 343
  25. 25.194 + 641 =
  26. 26.264 − 185 =
  27. 27.A train has 117 people in the front coaches and 258 people in the back coaches. How many people are on the train?
  28. 28.299 − 105 =
  29. 29.653 + ? = 922
  30. 30.791 + ? = 913
  31. 31.? + 260 = 697
  32. 32.? + 548 = 960
  33. 33.625 − 152 =
  34. 34.496 + 450 =
  35. 35.? − 365 = 264
  36. 36.A school has 327 children. 305 of them are girls. How many boys are there?
  37. 37.A school has 743 children. 388 of them are girls. How many boys are there?
  38. 38.A train has 575 people in the front coaches and 335 people in the back coaches. How many people are on the train?
  39. 39.692 − ? = 367
  40. 40.818 − 495 =

Answer key

  1. 85
  2. 737
  3. 54
  4. 846
  5. 11
  6. 206
  7. 304
  8. 555
  9. 410
  10. 900
  11. 99
  12. 842
  13. 460
  14. 960
  15. 49
  16. 877
  17. 279
  18. 726
  19. 541
  20. 14
  21. 412
  22. 430
  23. 121
  24. 168
  25. 835
  26. 79
  27. 375
  28. 194
  29. 269
  30. 122
  31. 437
  32. 412
  33. 473
  34. 946
  35. 629
  36. 22
  37. 355
  38. 910
  39. 325
  40. 323

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