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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 512 · 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. 1.217 + 478 =
  2. 2.520 − 330 =
  3. 3.? + 259 = 578
  4. 4.A train has 399 people in the front coaches and 465 people in the back coaches. How many people are on the train?
  5. 5.? + 267 = 463
  6. 6.? − 374 = 241
  7. 7.? − 222 = 10
  8. 8.A train has 556 people in the front coaches and 397 people in the back coaches. How many people are on the train?
  9. 9.259 + 165 =
  10. 10.A school has 894 children. 214 of them are girls. How many boys are there?
  11. 11.? − 304 = 229
  12. 12.820 − 153 =
  13. 13.569 − 559 =
  14. 14.? + 382 = 765
  15. 15.A school has 731 children. 354 of them are girls. How many boys are there?
  16. 16.354 − ? = 203
  17. 17.884 + 107 =
  18. 18.? − 129 = 147
  19. 19.670 − 446 =
  20. 20.383 − ? = 3
  21. 21.A school has 831 children. 588 of them are girls. How many boys are there?
  22. 22.597 − ? = 272
  23. 23.339 + 321 =
  24. 24.788 + ? = 913
  25. 25.889 − 274 =
  26. 26.A train has 247 people in the front coaches and 388 people in the back coaches. How many people are on the train?
  27. 27.? + 456 = 649
  28. 28.834 − 814 =
  29. 29.220 + 437 =
  30. 30.813 − 205 =
  31. 31.368 − 112 =
  32. 32.343 + 110 =
  33. 33.720 + 140 =
  34. 34.A train has 528 people in the front coaches and 419 people in the back coaches. How many people are on the train?
  35. 35.603 + 215 =
  36. 36.A school has 683 children. 356 of them are girls. How many boys are there?
  37. 37.582 + 210 =
  38. 38.A school has 655 children. 446 of them are girls. How many boys are there?
  39. 39.A school has 457 children. 428 of them are girls. How many boys are there?
  40. 40.465 + 227 =

Answer key

  1. 695
  2. 190
  3. 319
  4. 864
  5. 196
  6. 615
  7. 232
  8. 953
  9. 424
  10. 680
  11. 533
  12. 667
  13. 10
  14. 383
  15. 377
  16. 151
  17. 991
  18. 276
  19. 224
  20. 380
  21. 243
  22. 325
  23. 660
  24. 125
  25. 615
  26. 635
  27. 193
  28. 20
  29. 657
  30. 608
  31. 256
  32. 453
  33. 860
  34. 947
  35. 818
  36. 327
  37. 792
  38. 209
  39. 29
  40. 692

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