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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 408 · 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 train has 520 people in the front coaches and 372 people in the back coaches. How many people are on the train?
  2. 2.388 + 238 =
  3. 3.633 − 313 =
  4. 4.A train has 811 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  5. 5.268 − 201 =
  6. 6.? − 396 = 188
  7. 7.A school has 254 children. 221 of them are girls. How many boys are there?
  8. 8.855 − 608 =
  9. 9.? + 498 = 790
  10. 10.831 + ? = 945
  11. 11.A school has 337 children. 166 of them are girls. How many boys are there?
  12. 12.166 + 391 =
  13. 13.842 + ? = 985
  14. 14.524 − 171 =
  15. 15.A school has 621 children. 438 of them are girls. How many boys are there?
  16. 16.776 + 214 =
  17. 17.A school has 731 children. 244 of them are girls. How many boys are there?
  18. 18.537 + 376 =
  19. 19.820 + ? = 990
  20. 20.? − 164 = 235
  21. 21.777 + 102 =
  22. 22.A school has 394 children. 362 of them are girls. How many boys are there?
  23. 23.A train has 275 people in the front coaches and 358 people in the back coaches. How many people are on the train?
  24. 24.? + 352 = 556
  25. 25.205 + 711 =
  26. 26.A train has 172 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  27. 27.495 − ? = 36
  28. 28.402 + 334 =
  29. 29.880 + 116 =
  30. 30.A school has 825 children. 650 of them are girls. How many boys are there?
  31. 31.389 − ? = 91
  32. 32.A school has 323 children. 211 of them are girls. How many boys are there?
  33. 33.341 − 148 =
  34. 34.A school has 357 children. 136 of them are girls. How many boys are there?
  35. 35.483 − 206 =
  36. 36.548 − 438 =
  37. 37.741 − ? = 226
  38. 38.667 − 649 =
  39. 39.605 + 306 =
  40. 40.A school has 414 children. 294 of them are girls. How many boys are there?

Answer key

  1. 892
  2. 626
  3. 320
  4. 929
  5. 67
  6. 584
  7. 33
  8. 247
  9. 292
  10. 114
  11. 171
  12. 557
  13. 143
  14. 353
  15. 183
  16. 990
  17. 487
  18. 913
  19. 170
  20. 399
  21. 879
  22. 32
  23. 633
  24. 204
  25. 916
  26. 352
  27. 459
  28. 736
  29. 996
  30. 175
  31. 298
  32. 112
  33. 193
  34. 221
  35. 277
  36. 110
  37. 515
  38. 18
  39. 911
  40. 120

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