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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 609 · 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 school has 513 children. 393 of them are girls. How many boys are there?
  2. 2.? − 144 = 147
  3. 3.783 − 504 =
  4. 4.A school has 384 children. 124 of them are girls. How many boys are there?
  5. 5.331 + 423 =
  6. 6.787 + 123 =
  7. 7.A school has 321 children. 167 of them are girls. How many boys are there?
  8. 8.196 + 482 =
  9. 9.A school has 410 children. 235 of them are girls. How many boys are there?
  10. 10.409 − 389 =
  11. 11.A school has 734 children. 183 of them are girls. How many boys are there?
  12. 12.? + 335 = 834
  13. 13.194 + 759 =
  14. 14.386 + 210 =
  15. 15.697 + 183 =
  16. 16.596 + 150 =
  17. 17.? + 352 = 627
  18. 18.A school has 977 children. 288 of them are girls. How many boys are there?
  19. 19.799 − 463 =
  20. 20.A train has 462 people in the front coaches and 272 people in the back coaches. How many people are on the train?
  21. 21.A train has 481 people in the front coaches and 416 people in the back coaches. How many people are on the train?
  22. 22.? − 287 = 272
  23. 23.349 + 453 =
  24. 24.214 − 177 =
  25. 25.A school has 396 children. 135 of them are girls. How many boys are there?
  26. 26.526 + ? = 696
  27. 27.A train has 794 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  28. 28.320 + 127 =
  29. 29.904 − 807 =
  30. 30.603 + 309 =
  31. 31.A school has 697 children. 215 of them are girls. How many boys are there?
  32. 32.A school has 268 children. 226 of them are girls. How many boys are there?
  33. 33.210 + 183 =
  34. 34.348 − 309 =
  35. 35.A train has 243 people in the front coaches and 252 people in the back coaches. How many people are on the train?
  36. 36.? − 719 = 122
  37. 37.? − 541 = 194
  38. 38.870 − 679 =
  39. 39.292 + 697 =
  40. 40.910 − 591 =

Answer key

  1. 120
  2. 291
  3. 279
  4. 260
  5. 754
  6. 910
  7. 154
  8. 678
  9. 175
  10. 20
  11. 551
  12. 499
  13. 953
  14. 596
  15. 880
  16. 746
  17. 275
  18. 689
  19. 336
  20. 734
  21. 897
  22. 559
  23. 802
  24. 37
  25. 261
  26. 170
  27. 915
  28. 447
  29. 97
  30. 912
  31. 482
  32. 42
  33. 393
  34. 39
  35. 495
  36. 841
  37. 735
  38. 191
  39. 989
  40. 319

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