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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 895 · 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. 1.590 + ? = 880
  2. 2.686 − 120 =
  3. 3.? − 320 = 467
  4. 4.? − 209 = 443
  5. 5.A school has 426 children. 304 of them are girls. How many boys are there?
  6. 6.A train has 116 people in the front coaches and 255 people in the back coaches. How many people are on the train?
  7. 7.220 + 461 =
  8. 8.A train has 306 people in the front coaches and 435 people in the back coaches. How many people are on the train?
  9. 9.A school has 774 children. 163 of them are girls. How many boys are there?
  10. 10.A school has 936 children. 649 of them are girls. How many boys are there?
  11. 11.523 − 199 =
  12. 12.? − 808 = 88
  13. 13.? + 697 = 908
  14. 14.A train has 342 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  15. 15.A train has 520 people in the front coaches and 279 people in the back coaches. How many people are on the train?
  16. 16.694 + ? = 929
  17. 17.? − 522 = 360
  18. 18.A school has 759 children. 690 of them are girls. How many boys are there?
  19. 19.A school has 839 children. 769 of them are girls. How many boys are there?
  20. 20.128 + 616 =
  21. 21.372 − 273 =
  22. 22.A school has 526 children. 121 of them are girls. How many boys are there?
  23. 23.243 + ? = 577
  24. 24.198 + ? = 705
  25. 25.122 + 226 =
  26. 26.837 + 144 =
  27. 27.A train has 509 people in the front coaches and 239 people in the back coaches. How many people are on the train?
  28. 28.925 − ? = 226
  29. 29.116 + 243 =
  30. 30.310 − ? = 178
  31. 31.468 − ? = 221
  32. 32.A school has 754 children. 735 of them are girls. How many boys are there?
  33. 33.914 − ? = 401
  34. 34.A school has 239 children. 108 of them are girls. How many boys are there?
  35. 35.A train has 322 people in the front coaches and 143 people in the back coaches. How many people are on the train?
  36. 36.A school has 391 children. 170 of them are girls. How many boys are there?
  37. 37.308 + 331 =
  38. 38.132 + ? = 387
  39. 39.432 + ? = 672
  40. 40.A school has 614 children. 305 of them are girls. How many boys are there?

Answer key

  1. 290
  2. 566
  3. 787
  4. 652
  5. 122
  6. 371
  7. 681
  8. 741
  9. 611
  10. 287
  11. 324
  12. 896
  13. 211
  14. 491
  15. 799
  16. 235
  17. 882
  18. 69
  19. 70
  20. 744
  21. 99
  22. 405
  23. 334
  24. 507
  25. 348
  26. 981
  27. 748
  28. 699
  29. 359
  30. 132
  31. 247
  32. 19
  33. 513
  34. 131
  35. 465
  36. 221
  37. 639
  38. 255
  39. 240
  40. 309

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