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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 986 · 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. 1.549 + 368 =
  2. 2.? + 212 = 524
  3. 3.? − 200 = 118
  4. 4.? − 235 = 244
  5. 5.A train has 123 people in the front coaches and 447 people in the back coaches. How many people are on the train?
  6. 6.327 − 286 =
  7. 7.455 − 115 =
  8. 8.545 + 252 =
  9. 9.? + 871 = 986
  10. 10.930 − 155 =
  11. 11.? + 814 = 935
  12. 12.? + 129 = 444
  13. 13.518 + 206 =
  14. 14.650 − ? = 518
  15. 15.A train has 885 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  16. 16.491 + 465 =
  17. 17.A school has 713 children. 471 of them are girls. How many boys are there?
  18. 18.? − 945 = 39
  19. 19.146 + 268 =
  20. 20.A school has 268 children. 157 of them are girls. How many boys are there?
  21. 21.309 − ? = 166
  22. 22.218 − ? = 80
  23. 23.358 − 191 =
  24. 24.? − 211 = 221
  25. 25.A train has 308 people in the front coaches and 606 people in the back coaches. How many people are on the train?
  26. 26.495 + ? = 635
  27. 27.A school has 279 children. 122 of them are girls. How many boys are there?
  28. 28.358 + 356 =
  29. 29.A train has 602 people in the front coaches and 354 people in the back coaches. How many people are on the train?
  30. 30.934 − 911 =
  31. 31.497 + ? = 729
  32. 32.525 + 120 =
  33. 33.? − 561 = 202
  34. 34.? + 256 = 410
  35. 35.? + 192 = 306
  36. 36.A school has 388 children. 109 of them are girls. How many boys are there?
  37. 37.408 − 388 =
  38. 38.A train has 350 people in the front coaches and 217 people in the back coaches. How many people are on the train?
  39. 39.480 + ? = 777
  40. 40.? + 778 = 890

Answer key

  1. 917
  2. 312
  3. 318
  4. 479
  5. 570
  6. 41
  7. 340
  8. 797
  9. 115
  10. 775
  11. 121
  12. 315
  13. 724
  14. 132
  15. 990
  16. 956
  17. 242
  18. 984
  19. 414
  20. 111
  21. 143
  22. 138
  23. 167
  24. 432
  25. 914
  26. 140
  27. 157
  28. 714
  29. 956
  30. 23
  31. 232
  32. 645
  33. 763
  34. 154
  35. 114
  36. 279
  37. 20
  38. 567
  39. 297
  40. 112

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