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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 76 · 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.? + 824 = 974
  2. 2.549 + 305 =
  3. 3.A train has 123 people in the front coaches and 296 people in the back coaches. How many people are on the train?
  4. 4.? − 335 = 487
  5. 5.525 − 302 =
  6. 6.? − 490 = 204
  7. 7.417 − 176 =
  8. 8.815 + 120 =
  9. 9.840 − ? = 633
  10. 10.183 + 320 =
  11. 11.357 − ? = 58
  12. 12.? + 243 = 775
  13. 13.A train has 535 people in the front coaches and 453 people in the back coaches. How many people are on the train?
  14. 14.A school has 962 children. 819 of them are girls. How many boys are there?
  15. 15.? + 819 = 922
  16. 16.492 + 406 =
  17. 17.381 + 249 =
  18. 18.A train has 837 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  19. 19.A train has 286 people in the front coaches and 669 people in the back coaches. How many people are on the train?
  20. 20.740 − ? = 192
  21. 21.A school has 443 children. 387 of them are girls. How many boys are there?
  22. 22.670 + 138 =
  23. 23.298 + ? = 700
  24. 24.584 − ? = 412
  25. 25.? − 151 = 196
  26. 26.A school has 789 children. 656 of them are girls. How many boys are there?
  27. 27.434 − 138 =
  28. 28.349 + 305 =
  29. 29.? − 230 = 291
  30. 30.A school has 450 children. 106 of them are girls. How many boys are there?
  31. 31.? − 346 = 466
  32. 32.154 + 353 =
  33. 33.A train has 354 people in the front coaches and 525 people in the back coaches. How many people are on the train?
  34. 34.? + 166 = 911
  35. 35.A train has 428 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  36. 36.A train has 590 people in the front coaches and 245 people in the back coaches. How many people are on the train?
  37. 37.? − 102 = 449
  38. 38.215 − ? = 91
  39. 39.A train has 303 people in the front coaches and 516 people in the back coaches. How many people are on the train?
  40. 40.A school has 843 children. 793 of them are girls. How many boys are there?

Answer key

  1. 150
  2. 854
  3. 419
  4. 822
  5. 223
  6. 694
  7. 241
  8. 935
  9. 207
  10. 503
  11. 299
  12. 532
  13. 988
  14. 143
  15. 103
  16. 898
  17. 630
  18. 946
  19. 955
  20. 548
  21. 56
  22. 808
  23. 402
  24. 172
  25. 347
  26. 133
  27. 296
  28. 654
  29. 521
  30. 344
  31. 812
  32. 507
  33. 879
  34. 745
  35. 581
  36. 835
  37. 551
  38. 124
  39. 819
  40. 50

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