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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 307 · 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. 1.228 − 108 =
  2. 2.A train has 190 people in the front coaches and 354 people in the back coaches. How many people are on the train?
  3. 3.337 + 300 =
  4. 4.899 + ? = 999
  5. 5.708 + ? = 938
  6. 6.A school has 728 children. 607 of them are girls. How many boys are there?
  7. 7.A train has 528 people in the front coaches and 259 people in the back coaches. How many people are on the train?
  8. 8.A train has 729 people in the front coaches and 151 people in the back coaches. How many people are on the train?
  9. 9.A train has 546 people in the front coaches and 394 people in the back coaches. How many people are on the train?
  10. 10.A school has 909 children. 690 of them are girls. How many boys are there?
  11. 11.166 + 492 =
  12. 12.? + 468 = 881
  13. 13.? + 563 = 772
  14. 14.431 − ? = 295
  15. 15.577 + ? = 969
  16. 16.598 + 287 =
  17. 17.275 + ? = 768
  18. 18.? + 708 = 943
  19. 19.911 − ? = 808
  20. 20.? − 116 = 564
  21. 21.826 + 120 =
  22. 22.? + 350 = 697
  23. 23.? + 156 = 276
  24. 24.502 − 263 =
  25. 25.? + 896 = 999
  26. 26.427 − ? = 274
  27. 27.749 + 187 =
  28. 28.A train has 346 people in the front coaches and 649 people in the back coaches. How many people are on the train?
  29. 29.658 + 279 =
  30. 30.A train has 583 people in the front coaches and 400 people in the back coaches. How many people are on the train?
  31. 31.283 + ? = 734
  32. 32.A train has 705 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  33. 33.A train has 484 people in the front coaches and 200 people in the back coaches. How many people are on the train?
  34. 34.? − 406 = 442
  35. 35.732 − 256 =
  36. 36.A school has 535 children. 238 of them are girls. How many boys are there?
  37. 37.A train has 302 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  38. 38.583 − ? = 386
  39. 39.847 + 113 =
  40. 40.A school has 398 children. 162 of them are girls. How many boys are there?

Answer key

  1. 120
  2. 544
  3. 637
  4. 100
  5. 230
  6. 121
  7. 787
  8. 880
  9. 940
  10. 219
  11. 658
  12. 413
  13. 209
  14. 136
  15. 392
  16. 885
  17. 493
  18. 235
  19. 103
  20. 680
  21. 946
  22. 347
  23. 120
  24. 239
  25. 103
  26. 153
  27. 936
  28. 995
  29. 937
  30. 983
  31. 451
  32. 830
  33. 684
  34. 848
  35. 476
  36. 297
  37. 411
  38. 197
  39. 960
  40. 236

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