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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 319 · 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.? − 359 = 420
  2. 2.945 − ? = 644
  3. 3.743 + 155 =
  4. 4.277 + 186 =
  5. 5.? − 138 = 107
  6. 6.A school has 347 children. 343 of them are girls. How many boys are there?
  7. 7.A train has 823 people in the front coaches and 157 people in the back coaches. How many people are on the train?
  8. 8.A train has 484 people in the front coaches and 470 people in the back coaches. How many people are on the train?
  9. 9.575 + 395 =
  10. 10.398 − 141 =
  11. 11.? + 231 = 891
  12. 12.561 + ? = 832
  13. 13.A school has 638 children. 215 of them are girls. How many boys are there?
  14. 14.A train has 787 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  15. 15.640 + 167 =
  16. 16.? + 698 = 913
  17. 17.A school has 335 children. 213 of them are girls. How many boys are there?
  18. 18.428 + 200 =
  19. 19.A train has 874 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  20. 20.830 + 155 =
  21. 21.A school has 266 children. 236 of them are girls. How many boys are there?
  22. 22.658 − 285 =
  23. 23.A school has 606 children. 557 of them are girls. How many boys are there?
  24. 24.A school has 298 children. 144 of them are girls. How many boys are there?
  25. 25.404 − 152 =
  26. 26.329 + ? = 434
  27. 27.975 − ? = 24
  28. 28.? − 179 = 192
  29. 29.A train has 403 people in the front coaches and 510 people in the back coaches. How many people are on the train?
  30. 30.856 − 751 =
  31. 31.532 − ? = 332
  32. 32.A school has 338 children. 180 of them are girls. How many boys are there?
  33. 33.A school has 712 children. 478 of them are girls. How many boys are there?
  34. 34.A train has 881 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  35. 35.602 + ? = 778
  36. 36.269 + 543 =
  37. 37.? − 201 = 318
  38. 38.A school has 210 children. 131 of them are girls. How many boys are there?
  39. 39.A train has 182 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  40. 40.629 + 112 =

Answer key

  1. 779
  2. 301
  3. 898
  4. 463
  5. 245
  6. 4
  7. 980
  8. 954
  9. 970
  10. 257
  11. 660
  12. 271
  13. 423
  14. 889
  15. 807
  16. 215
  17. 122
  18. 628
  19. 975
  20. 985
  21. 30
  22. 373
  23. 49
  24. 154
  25. 252
  26. 105
  27. 951
  28. 371
  29. 913
  30. 105
  31. 200
  32. 158
  33. 234
  34. 995
  35. 176
  36. 812
  37. 519
  38. 79
  39. 384
  40. 741

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