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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 990 · 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. 1.751 + 149 =
  2. 2.711 − 628 =
  3. 3.A train has 318 people in the front coaches and 638 people in the back coaches. How many people are on the train?
  4. 4.A train has 590 people in the front coaches and 256 people in the back coaches. How many people are on the train?
  5. 5.266 + 235 =
  6. 6.? + 209 = 874
  7. 7.345 + 298 =
  8. 8.A school has 457 children. 270 of them are girls. How many boys are there?
  9. 9.872 + ? = 973
  10. 10.A train has 184 people in the front coaches and 140 people in the back coaches. How many people are on the train?
  11. 11.750 − 341 =
  12. 12.576 + 188 =
  13. 13.A school has 496 children. 162 of them are girls. How many boys are there?
  14. 14.723 + ? = 983
  15. 15.A school has 518 children. 360 of them are girls. How many boys are there?
  16. 16.A school has 328 children. 262 of them are girls. How many boys are there?
  17. 17.713 − ? = 368
  18. 18.? − 749 = 124
  19. 19.? + 470 = 796
  20. 20.352 − 180 =
  21. 21.A train has 148 people in the front coaches and 774 people in the back coaches. How many people are on the train?
  22. 22.367 − 120 =
  23. 23.A train has 369 people in the front coaches and 589 people in the back coaches. How many people are on the train?
  24. 24.447 − 327 =
  25. 25.407 + ? = 558
  26. 26.A train has 223 people in the front coaches and 753 people in the back coaches. How many people are on the train?
  27. 27.624 − 193 =
  28. 28.674 − 109 =
  29. 29.734 − 730 =
  30. 30.891 − 123 =
  31. 31.496 − 199 =
  32. 32.430 − 361 =
  33. 33.575 + 192 =
  34. 34.A train has 327 people in the front coaches and 525 people in the back coaches. How many people are on the train?
  35. 35.A train has 352 people in the front coaches and 246 people in the back coaches. How many people are on the train?
  36. 36.? + 831 = 954
  37. 37.A school has 330 children. 214 of them are girls. How many boys are there?
  38. 38.533 − ? = 155
  39. 39.A school has 251 children. 217 of them are girls. How many boys are there?
  40. 40.269 + 428 =

Answer key

  1. 900
  2. 83
  3. 956
  4. 846
  5. 501
  6. 665
  7. 643
  8. 187
  9. 101
  10. 324
  11. 409
  12. 764
  13. 334
  14. 260
  15. 158
  16. 66
  17. 345
  18. 873
  19. 326
  20. 172
  21. 922
  22. 247
  23. 958
  24. 120
  25. 151
  26. 976
  27. 431
  28. 565
  29. 4
  30. 768
  31. 297
  32. 69
  33. 767
  34. 852
  35. 598
  36. 123
  37. 116
  38. 378
  39. 34
  40. 697

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