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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 208 · 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. 1.271 + 635 =
  2. 2.A train has 139 people in the front coaches and 364 people in the back coaches. How many people are on the train?
  3. 3.? + 886 = 987
  4. 4.A school has 865 children. 165 of them are girls. How many boys are there?
  5. 5.A train has 347 people in the front coaches and 231 people in the back coaches. How many people are on the train?
  6. 6.667 − 236 =
  7. 7.863 + 123 =
  8. 8.? + 257 = 876
  9. 9.500 + ? = 859
  10. 10.143 + 297 =
  11. 11.A train has 709 people in the front coaches and 182 people in the back coaches. How many people are on the train?
  12. 12.A train has 396 people in the front coaches and 568 people in the back coaches. How many people are on the train?
  13. 13.126 + 456 =
  14. 14.? − 473 = 293
  15. 15.? + 808 = 948
  16. 16.249 − 119 =
  17. 17.941 − ? = 180
  18. 18.500 + 299 =
  19. 19.413 + 230 =
  20. 20.994 − 324 =
  21. 21.968 − ? = 850
  22. 22.A school has 520 children. 264 of them are girls. How many boys are there?
  23. 23.? + 144 = 864
  24. 24.190 + 360 =
  25. 25.110 + 362 =
  26. 26.A train has 525 people in the front coaches and 335 people in the back coaches. How many people are on the train?
  27. 27.750 − ? = 599
  28. 28.441 − ? = 315
  29. 29.A train has 201 people in the front coaches and 199 people in the back coaches. How many people are on the train?
  30. 30.102 + ? = 460
  31. 31.658 − 361 =
  32. 32.A school has 460 children. 163 of them are girls. How many boys are there?
  33. 33.678 − 136 =
  34. 34.? + 251 = 741
  35. 35.A school has 613 children. 113 of them are girls. How many boys are there?
  36. 36.876 − ? = 179
  37. 37.715 − 629 =
  38. 38.A school has 461 children. 267 of them are girls. How many boys are there?
  39. 39.942 − 865 =
  40. 40.? + 327 = 728

Answer key

  1. 906
  2. 503
  3. 101
  4. 700
  5. 578
  6. 431
  7. 986
  8. 619
  9. 359
  10. 440
  11. 891
  12. 964
  13. 582
  14. 766
  15. 140
  16. 130
  17. 761
  18. 799
  19. 643
  20. 670
  21. 118
  22. 256
  23. 720
  24. 550
  25. 472
  26. 860
  27. 151
  28. 126
  29. 400
  30. 358
  31. 297
  32. 297
  33. 542
  34. 490
  35. 500
  36. 697
  37. 86
  38. 194
  39. 77
  40. 401

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