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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 639 · 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 742 people in the front coaches and 114 people in the back coaches. How many people are on the train?
  2. 2.394 − ? = 256
  3. 3.152 + 448 =
  4. 4.541 − ? = 18
  5. 5.881 − 838 =
  6. 6.358 − 171 =
  7. 7.889 + ? = 997
  8. 8.447 + 288 =
  9. 9.? + 706 = 865
  10. 10.425 + ? = 740
  11. 11.243 + 375 =
  12. 12.159 + 228 =
  13. 13.697 + 249 =
  14. 14.A school has 743 children. 156 of them are girls. How many boys are there?
  15. 15.671 − ? = 183
  16. 16.227 + 444 =
  17. 17.A school has 562 children. 479 of them are girls. How many boys are there?
  18. 18.? + 389 = 974
  19. 19.A train has 348 people in the front coaches and 286 people in the back coaches. How many people are on the train?
  20. 20.A school has 333 children. 277 of them are girls. How many boys are there?
  21. 21.? + 858 = 971
  22. 22.A train has 863 people in the front coaches and 118 people in the back coaches. How many people are on the train?
  23. 23.381 + 162 =
  24. 24.871 + ? = 975
  25. 25.? − 135 = 79
  26. 26.A train has 459 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  27. 27.484 − 196 =
  28. 28.397 − ? = 224
  29. 29.535 + 442 =
  30. 30.630 − ? = 124
  31. 31.570 + ? = 858
  32. 32.662 + 177 =
  33. 33.? + 411 = 884
  34. 34.981 − ? = 397
  35. 35.285 − 254 =
  36. 36.879 − 430 =
  37. 37.102 + ? = 617
  38. 38.A train has 231 people in the front coaches and 559 people in the back coaches. How many people are on the train?
  39. 39.A train has 613 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  40. 40.A school has 368 children. 127 of them are girls. How many boys are there?

Answer key

  1. 856
  2. 138
  3. 600
  4. 523
  5. 43
  6. 187
  7. 108
  8. 735
  9. 159
  10. 315
  11. 618
  12. 387
  13. 946
  14. 587
  15. 488
  16. 671
  17. 83
  18. 585
  19. 634
  20. 56
  21. 113
  22. 981
  23. 543
  24. 104
  25. 214
  26. 579
  27. 288
  28. 173
  29. 977
  30. 506
  31. 288
  32. 839
  33. 473
  34. 584
  35. 31
  36. 449
  37. 515
  38. 790
  39. 815
  40. 241

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