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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 956 · 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.? + 762 = 999
  2. 2.? − 222 = 457
  3. 3.846 + 113 =
  4. 4.A train has 891 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  5. 5.521 − 374 =
  6. 6.? − 140 = 136
  7. 7.407 − 359 =
  8. 8.? + 706 = 847
  9. 9.? − 466 = 144
  10. 10.A school has 266 children. 110 of them are girls. How many boys are there?
  11. 11.650 − ? = 358
  12. 12.? + 415 = 733
  13. 13.? − 215 = 371
  14. 14.A train has 705 people in the front coaches and 147 people in the back coaches. How many people are on the train?
  15. 15.? − 182 = 60
  16. 16.378 − 176 =
  17. 17.456 + ? = 821
  18. 18.597 + 290 =
  19. 19.546 − 482 =
  20. 20.389 + 106 =
  21. 21.337 − ? = 85
  22. 22.620 + 134 =
  23. 23.A train has 161 people in the front coaches and 272 people in the back coaches. How many people are on the train?
  24. 24.A school has 784 children. 471 of them are girls. How many boys are there?
  25. 25.637 − 173 =
  26. 26.631 − 331 =
  27. 27.183 + 795 =
  28. 28.A school has 743 children. 390 of them are girls. How many boys are there?
  29. 29.A school has 354 children. 136 of them are girls. How many boys are there?
  30. 30.A school has 829 children. 533 of them are girls. How many boys are there?
  31. 31.704 − 460 =
  32. 32.250 + 214 =
  33. 33.365 − 226 =
  34. 34.? + 102 = 887
  35. 35.A train has 493 people in the front coaches and 458 people in the back coaches. How many people are on the train?
  36. 36.A school has 980 children. 810 of them are girls. How many boys are there?
  37. 37.567 − 131 =
  38. 38.645 + 133 =
  39. 39.? + 424 = 941
  40. 40.755 − 399 =

Answer key

  1. 237
  2. 679
  3. 959
  4. 991
  5. 147
  6. 276
  7. 48
  8. 141
  9. 610
  10. 156
  11. 292
  12. 318
  13. 586
  14. 852
  15. 242
  16. 202
  17. 365
  18. 887
  19. 64
  20. 495
  21. 252
  22. 754
  23. 433
  24. 313
  25. 464
  26. 300
  27. 978
  28. 353
  29. 218
  30. 296
  31. 244
  32. 464
  33. 139
  34. 785
  35. 951
  36. 170
  37. 436
  38. 778
  39. 517
  40. 356

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