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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 131 · 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. 1.311 + ? = 521
  2. 2.A train has 705 people in the front coaches and 128 people in the back coaches. How many people are on the train?
  3. 3.100 + 506 =
  4. 4.326 + 516 =
  5. 5.A train has 116 people in the front coaches and 441 people in the back coaches. How many people are on the train?
  6. 6.635 + ? = 943
  7. 7.250 + 406 =
  8. 8.A train has 391 people in the front coaches and 155 people in the back coaches. How many people are on the train?
  9. 9.? − 426 = 443
  10. 10.? + 747 = 994
  11. 11.A school has 307 children. 125 of them are girls. How many boys are there?
  12. 12.991 − 408 =
  13. 13.A school has 899 children. 444 of them are girls. How many boys are there?
  14. 14.A school has 784 children. 196 of them are girls. How many boys are there?
  15. 15.881 − 487 =
  16. 16.322 + ? = 442
  17. 17.152 + 113 =
  18. 18.A train has 637 people in the front coaches and 148 people in the back coaches. How many people are on the train?
  19. 19.315 + 598 =
  20. 20.A school has 470 children. 310 of them are girls. How many boys are there?
  21. 21.638 + 341 =
  22. 22.336 − 131 =
  23. 23.? + 337 = 513
  24. 24.? − 167 = 649
  25. 25.? − 602 = 28
  26. 26.A train has 106 people in the front coaches and 631 people in the back coaches. How many people are on the train?
  27. 27.166 + 804 =
  28. 28.A train has 254 people in the front coaches and 536 people in the back coaches. How many people are on the train?
  29. 29.383 − 325 =
  30. 30.A train has 766 people in the front coaches and 216 people in the back coaches. How many people are on the train?
  31. 31.541 − ? = 150
  32. 32.A train has 687 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  33. 33.? − 113 = 777
  34. 34.919 − ? = 749
  35. 35.? + 682 = 798
  36. 36.449 − ? = 82
  37. 37.A train has 195 people in the front coaches and 424 people in the back coaches. How many people are on the train?
  38. 38.A school has 714 children. 268 of them are girls. How many boys are there?
  39. 39.? − 217 = 195
  40. 40.781 − ? = 52

Answer key

  1. 210
  2. 833
  3. 606
  4. 842
  5. 557
  6. 308
  7. 656
  8. 546
  9. 869
  10. 247
  11. 182
  12. 583
  13. 455
  14. 588
  15. 394
  16. 120
  17. 265
  18. 785
  19. 913
  20. 160
  21. 979
  22. 205
  23. 176
  24. 816
  25. 630
  26. 737
  27. 970
  28. 790
  29. 58
  30. 982
  31. 391
  32. 805
  33. 890
  34. 170
  35. 116
  36. 367
  37. 619
  38. 446
  39. 412
  40. 729

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