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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 23 · 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. 1.253 − ? = 104
  2. 2.? + 460 = 736
  3. 3.597 + 139 =
  4. 4.208 + ? = 658
  5. 5.650 + 347 =
  6. 6.A school has 849 children. 727 of them are girls. How many boys are there?
  7. 7.A school has 287 children. 254 of them are girls. How many boys are there?
  8. 8.259 + ? = 727
  9. 9.A train has 707 people in the front coaches and 227 people in the back coaches. How many people are on the train?
  10. 10.851 − 398 =
  11. 11.A school has 708 children. 427 of them are girls. How many boys are there?
  12. 12.? + 569 = 912
  13. 13.A train has 298 people in the front coaches and 601 people in the back coaches. How many people are on the train?
  14. 14.A school has 613 children. 526 of them are girls. How many boys are there?
  15. 15.? + 711 = 957
  16. 16.A school has 286 children. 248 of them are girls. How many boys are there?
  17. 17.A school has 459 children. 372 of them are girls. How many boys are there?
  18. 18.424 − 103 =
  19. 19.A school has 226 children. 225 of them are girls. How many boys are there?
  20. 20.A school has 594 children. 169 of them are girls. How many boys are there?
  21. 21.117 + 163 =
  22. 22.A school has 794 children. 661 of them are girls. How many boys are there?
  23. 23.A train has 263 people in the front coaches and 376 people in the back coaches. How many people are on the train?
  24. 24.715 + ? = 869
  25. 25.A train has 575 people in the front coaches and 183 people in the back coaches. How many people are on the train?
  26. 26.435 + 168 =
  27. 27.582 + 119 =
  28. 28.? + 470 = 709
  29. 29.A train has 471 people in the front coaches and 518 people in the back coaches. How many people are on the train?
  30. 30.719 + ? = 856
  31. 31.828 + ? = 940
  32. 32.475 + ? = 866
  33. 33.784 − 518 =
  34. 34.A train has 214 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  35. 35.382 + ? = 488
  36. 36.A train has 822 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  37. 37.A school has 323 children. 292 of them are girls. How many boys are there?
  38. 38.A train has 821 people in the front coaches and 113 people in the back coaches. How many people are on the train?
  39. 39.375 + 617 =
  40. 40.A school has 368 children. 207 of them are girls. How many boys are there?

Answer key

  1. 149
  2. 276
  3. 736
  4. 450
  5. 997
  6. 122
  7. 33
  8. 468
  9. 934
  10. 453
  11. 281
  12. 343
  13. 899
  14. 87
  15. 246
  16. 38
  17. 87
  18. 321
  19. 1
  20. 425
  21. 280
  22. 133
  23. 639
  24. 154
  25. 758
  26. 603
  27. 701
  28. 239
  29. 989
  30. 137
  31. 112
  32. 391
  33. 266
  34. 325
  35. 106
  36. 927
  37. 31
  38. 934
  39. 992
  40. 161

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