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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 414 · 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.A school has 392 children. 136 of them are girls. How many boys are there?
  2. 2.A school has 232 children. 129 of them are girls. How many boys are there?
  3. 3.279 − ? = 141
  4. 4.679 − 399 =
  5. 5.634 + 302 =
  6. 6.705 + 234 =
  7. 7.747 − 441 =
  8. 8.A train has 271 people in the front coaches and 396 people in the back coaches. How many people are on the train?
  9. 9.225 + ? = 821
  10. 10.268 − 164 =
  11. 11.633 + 232 =
  12. 12.A school has 503 children. 196 of them are girls. How many boys are there?
  13. 13.249 + ? = 458
  14. 14.A train has 337 people in the front coaches and 312 people in the back coaches. How many people are on the train?
  15. 15.806 − 303 =
  16. 16.A train has 689 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  17. 17.772 − 626 =
  18. 18.A school has 454 children. 329 of them are girls. How many boys are there?
  19. 19.A train has 286 people in the front coaches and 213 people in the back coaches. How many people are on the train?
  20. 20.? + 627 = 950
  21. 21.441 − 234 =
  22. 22.A school has 345 children. 157 of them are girls. How many boys are there?
  23. 23.425 − ? = 80
  24. 24.A school has 993 children. 172 of them are girls. How many boys are there?
  25. 25.271 + 419 =
  26. 26.731 − 242 =
  27. 27.? + 181 = 465
  28. 28.A train has 614 people in the front coaches and 194 people in the back coaches. How many people are on the train?
  29. 29.A school has 798 children. 280 of them are girls. How many boys are there?
  30. 30.A train has 228 people in the front coaches and 553 people in the back coaches. How many people are on the train?
  31. 31.853 − 809 =
  32. 32.? + 235 = 702
  33. 33.? − 451 = 395
  34. 34.A train has 428 people in the front coaches and 161 people in the back coaches. How many people are on the train?
  35. 35.A train has 751 people in the front coaches and 101 people in the back coaches. How many people are on the train?
  36. 36.531 + ? = 789
  37. 37.? − 698 = 197
  38. 38.? + 575 = 790
  39. 39.178 + ? = 900
  40. 40.? − 170 = 460

Answer key

  1. 256
  2. 103
  3. 138
  4. 280
  5. 936
  6. 939
  7. 306
  8. 667
  9. 596
  10. 104
  11. 865
  12. 307
  13. 209
  14. 649
  15. 503
  16. 838
  17. 146
  18. 125
  19. 499
  20. 323
  21. 207
  22. 188
  23. 345
  24. 821
  25. 690
  26. 489
  27. 284
  28. 808
  29. 518
  30. 781
  31. 44
  32. 467
  33. 846
  34. 589
  35. 852
  36. 258
  37. 895
  38. 215
  39. 722
  40. 630

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