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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 118 · 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.? + 764 = 950
  2. 2.A train has 350 people in the front coaches and 476 people in the back coaches. How many people are on the train?
  3. 3.A school has 394 children. 334 of them are girls. How many boys are there?
  4. 4.687 − 431 =
  5. 5.333 − 148 =
  6. 6.468 − ? = 162
  7. 7.A train has 538 people in the front coaches and 450 people in the back coaches. How many people are on the train?
  8. 8.A train has 392 people in the front coaches and 288 people in the back coaches. How many people are on the train?
  9. 9.A school has 236 children. 116 of them are girls. How many boys are there?
  10. 10.A train has 686 people in the front coaches and 220 people in the back coaches. How many people are on the train?
  11. 11.A school has 497 children. 201 of them are girls. How many boys are there?
  12. 12.? − 477 = 23
  13. 13.194 + ? = 630
  14. 14.? + 214 = 892
  15. 15.? + 495 = 973
  16. 16.873 + ? = 975
  17. 17.A train has 639 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  18. 18.A train has 679 people in the front coaches and 218 people in the back coaches. How many people are on the train?
  19. 19.458 + 128 =
  20. 20.552 + 209 =
  21. 21.726 + 273 =
  22. 22.A school has 256 children. 228 of them are girls. How many boys are there?
  23. 23.303 + 158 =
  24. 24.541 − 491 =
  25. 25.A train has 881 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  26. 26.146 + 546 =
  27. 27.530 − ? = 358
  28. 28.554 − ? = 428
  29. 29.412 + 309 =
  30. 30.A school has 933 children. 676 of them are girls. How many boys are there?
  31. 31.A school has 391 children. 156 of them are girls. How many boys are there?
  32. 32.A school has 463 children. 358 of them are girls. How many boys are there?
  33. 33.803 − 381 =
  34. 34.A school has 297 children. 235 of them are girls. How many boys are there?
  35. 35.267 − 189 =
  36. 36.321 + 335 =
  37. 37.829 + 142 =
  38. 38.796 + 193 =
  39. 39.A train has 146 people in the front coaches and 479 people in the back coaches. How many people are on the train?
  40. 40.301 + 285 =

Answer key

  1. 186
  2. 826
  3. 60
  4. 256
  5. 185
  6. 306
  7. 988
  8. 680
  9. 120
  10. 906
  11. 296
  12. 500
  13. 436
  14. 678
  15. 478
  16. 102
  17. 947
  18. 897
  19. 586
  20. 761
  21. 999
  22. 28
  23. 461
  24. 50
  25. 989
  26. 692
  27. 172
  28. 126
  29. 721
  30. 257
  31. 235
  32. 105
  33. 422
  34. 62
  35. 78
  36. 656
  37. 971
  38. 989
  39. 625
  40. 586

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