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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 957 · 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 961 children. 465 of them are girls. How many boys are there?
  2. 2.113 + 768 =
  3. 3.? + 440 = 823
  4. 4.755 − ? = 17
  5. 5.603 + 324 =
  6. 6.244 − 233 =
  7. 7.A school has 990 children. 548 of them are girls. How many boys are there?
  8. 8.A school has 666 children. 347 of them are girls. How many boys are there?
  9. 9.? + 487 = 616
  10. 10.424 + 439 =
  11. 11.A school has 352 children. 343 of them are girls. How many boys are there?
  12. 12.A train has 523 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  13. 13.302 − 184 =
  14. 14.? − 471 = 201
  15. 15.A train has 119 people in the front coaches and 258 people in the back coaches. How many people are on the train?
  16. 16.966 − 617 =
  17. 17.622 + ? = 869
  18. 18.? − 429 = 153
  19. 19.268 − ? = 160
  20. 20.663 − 605 =
  21. 21.917 − 846 =
  22. 22.412 − 121 =
  23. 23.A train has 245 people in the front coaches and 539 people in the back coaches. How many people are on the train?
  24. 24.227 + 664 =
  25. 25.? + 823 = 937
  26. 26.428 + 187 =
  27. 27.A school has 969 children. 799 of them are girls. How many boys are there?
  28. 28.A train has 319 people in the front coaches and 390 people in the back coaches. How many people are on the train?
  29. 29.519 − ? = 58
  30. 30.281 + 655 =
  31. 31.252 − ? = 42
  32. 32.A school has 366 children. 123 of them are girls. How many boys are there?
  33. 33.597 − 169 =
  34. 34.743 + ? = 967
  35. 35.150 + 400 =
  36. 36.364 − 163 =
  37. 37.? + 506 = 982
  38. 38.736 + 206 =
  39. 39.435 − 149 =
  40. 40.? − 781 = 190

Answer key

  1. 496
  2. 881
  3. 383
  4. 738
  5. 927
  6. 11
  7. 442
  8. 319
  9. 129
  10. 863
  11. 9
  12. 629
  13. 118
  14. 672
  15. 377
  16. 349
  17. 247
  18. 582
  19. 108
  20. 58
  21. 71
  22. 291
  23. 784
  24. 891
  25. 114
  26. 615
  27. 170
  28. 709
  29. 461
  30. 936
  31. 210
  32. 243
  33. 428
  34. 224
  35. 550
  36. 201
  37. 476
  38. 942
  39. 286
  40. 971

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