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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 442 · 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. 1.496 + 131 =
  2. 2.528 + 138 =
  3. 3.496 − 328 =
  4. 4.A school has 808 children. 315 of them are girls. How many boys are there?
  5. 5.? + 536 = 687
  6. 6.A train has 399 people in the front coaches and 306 people in the back coaches. How many people are on the train?
  7. 7.284 − 126 =
  8. 8.214 + 371 =
  9. 9.544 + 246 =
  10. 10.412 − 358 =
  11. 11.661 + 187 =
  12. 12.A school has 338 children. 114 of them are girls. How many boys are there?
  13. 13.? − 308 = 39
  14. 14.A train has 208 people in the front coaches and 277 people in the back coaches. How many people are on the train?
  15. 15.773 − ? = 379
  16. 16.273 − 107 =
  17. 17.954 − 363 =
  18. 18.A school has 336 children. 179 of them are girls. How many boys are there?
  19. 19.964 − 459 =
  20. 20.341 − ? = 236
  21. 21.238 − 117 =
  22. 22.A school has 645 children. 552 of them are girls. How many boys are there?
  23. 23.A school has 438 children. 149 of them are girls. How many boys are there?
  24. 24.? + 452 = 898
  25. 25.375 − 310 =
  26. 26.664 − 561 =
  27. 27.A school has 760 children. 444 of them are girls. How many boys are there?
  28. 28.256 + 646 =
  29. 29.353 + 273 =
  30. 30.713 − 366 =
  31. 31.A school has 977 children. 879 of them are girls. How many boys are there?
  32. 32.A train has 247 people in the front coaches and 233 people in the back coaches. How many people are on the train?
  33. 33.A school has 465 children. 360 of them are girls. How many boys are there?
  34. 34.242 + 755 =
  35. 35.A train has 513 people in the front coaches and 385 people in the back coaches. How many people are on the train?
  36. 36.948 − ? = 349
  37. 37.? + 672 = 871
  38. 38.? + 519 = 754
  39. 39.463 − 203 =
  40. 40.863 − 401 =

Answer key

  1. 627
  2. 666
  3. 168
  4. 493
  5. 151
  6. 705
  7. 158
  8. 585
  9. 790
  10. 54
  11. 848
  12. 224
  13. 347
  14. 485
  15. 394
  16. 166
  17. 591
  18. 157
  19. 505
  20. 105
  21. 121
  22. 93
  23. 289
  24. 446
  25. 65
  26. 103
  27. 316
  28. 902
  29. 626
  30. 347
  31. 98
  32. 480
  33. 105
  34. 997
  35. 898
  36. 599
  37. 199
  38. 235
  39. 260
  40. 462

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