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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 82 · 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 train has 368 people in the front coaches and 495 people in the back coaches. How many people are on the train?
  2. 2.A school has 619 children. 356 of them are girls. How many boys are there?
  3. 3.716 − 565 =
  4. 4.A school has 557 children. 504 of them are girls. How many boys are there?
  5. 5.A school has 453 children. 414 of them are girls. How many boys are there?
  6. 6.A school has 386 children. 129 of them are girls. How many boys are there?
  7. 7.321 + ? = 446
  8. 8.A train has 836 people in the front coaches and 150 people in the back coaches. How many people are on the train?
  9. 9.679 + 127 =
  10. 10.A school has 796 children. 122 of them are girls. How many boys are there?
  11. 11.327 − ? = 200
  12. 12.? − 519 = 95
  13. 13.645 + 350 =
  14. 14.? + 303 = 950
  15. 15.556 + ? = 934
  16. 16.870 − 507 =
  17. 17.586 + 188 =
  18. 18.497 + ? = 635
  19. 19.? + 373 = 554
  20. 20.A school has 313 children. 106 of them are girls. How many boys are there?
  21. 21.? − 761 = 99
  22. 22.A train has 304 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  23. 23.656 + 151 =
  24. 24.A train has 410 people in the front coaches and 215 people in the back coaches. How many people are on the train?
  25. 25.944 − ? = 565
  26. 26.A school has 855 children. 255 of them are girls. How many boys are there?
  27. 27.860 − ? = 99
  28. 28.? − 259 = 275
  29. 29.A school has 556 children. 402 of them are girls. How many boys are there?
  30. 30.490 − 244 =
  31. 31.480 − ? = 328
  32. 32.? − 218 = 746
  33. 33.A school has 615 children. 445 of them are girls. How many boys are there?
  34. 34.A train has 753 people in the front coaches and 165 people in the back coaches. How many people are on the train?
  35. 35.225 − 102 =
  36. 36.861 − 208 =
  37. 37.A school has 789 children. 160 of them are girls. How many boys are there?
  38. 38.508 + 425 =
  39. 39.179 + 188 =
  40. 40.? + 159 = 276

Answer key

  1. 863
  2. 263
  3. 151
  4. 53
  5. 39
  6. 257
  7. 125
  8. 986
  9. 806
  10. 674
  11. 127
  12. 614
  13. 995
  14. 647
  15. 378
  16. 363
  17. 774
  18. 138
  19. 181
  20. 207
  21. 860
  22. 460
  23. 807
  24. 625
  25. 379
  26. 600
  27. 761
  28. 534
  29. 154
  30. 246
  31. 152
  32. 964
  33. 170
  34. 918
  35. 123
  36. 653
  37. 629
  38. 933
  39. 367
  40. 117

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