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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 446 · 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. 1.825 + ? = 990
  2. 2.A school has 368 children. 163 of them are girls. How many boys are there?
  3. 3.A train has 521 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  4. 4.A train has 542 people in the front coaches and 451 people in the back coaches. How many people are on the train?
  5. 5.A train has 379 people in the front coaches and 143 people in the back coaches. How many people are on the train?
  6. 6.A school has 256 children. 117 of them are girls. How many boys are there?
  7. 7.615 + ? = 976
  8. 8.A train has 503 people in the front coaches and 399 people in the back coaches. How many people are on the train?
  9. 9.A train has 198 people in the front coaches and 703 people in the back coaches. How many people are on the train?
  10. 10.319 + 649 =
  11. 11.A train has 794 people in the front coaches and 110 people in the back coaches. How many people are on the train?
  12. 12.834 + 157 =
  13. 13.887 + ? = 993
  14. 14.A school has 762 children. 114 of them are girls. How many boys are there?
  15. 15.316 − 137 =
  16. 16.A train has 620 people in the front coaches and 135 people in the back coaches. How many people are on the train?
  17. 17.A school has 830 children. 242 of them are girls. How many boys are there?
  18. 18.? + 476 = 773
  19. 19.450 − 150 =
  20. 20.773 − ? = 566
  21. 21.A school has 983 children. 294 of them are girls. How many boys are there?
  22. 22.A school has 217 children. 128 of them are girls. How many boys are there?
  23. 23.335 − 106 =
  24. 24.944 − ? = 800
  25. 25.723 − 302 =
  26. 26.635 − ? = 422
  27. 27.616 − ? = 77
  28. 28.A train has 571 people in the front coaches and 199 people in the back coaches. How many people are on the train?
  29. 29.550 − 234 =
  30. 30.168 + 205 =
  31. 31.834 + 101 =
  32. 32.A school has 400 children. 398 of them are girls. How many boys are there?
  33. 33.281 + ? = 815
  34. 34.798 + 146 =
  35. 35.? − 333 = 99
  36. 36.? + 406 = 810
  37. 37.A train has 884 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  38. 38.? + 452 = 584
  39. 39.? + 768 = 982
  40. 40.343 − ? = 103

Answer key

  1. 165
  2. 205
  3. 698
  4. 993
  5. 522
  6. 139
  7. 361
  8. 902
  9. 901
  10. 968
  11. 904
  12. 991
  13. 106
  14. 648
  15. 179
  16. 755
  17. 588
  18. 297
  19. 300
  20. 207
  21. 689
  22. 89
  23. 229
  24. 144
  25. 421
  26. 213
  27. 539
  28. 770
  29. 316
  30. 373
  31. 935
  32. 2
  33. 534
  34. 944
  35. 432
  36. 404
  37. 986
  38. 132
  39. 214
  40. 240

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