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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 378 · 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. 1.624 − 500 =
  2. 2.601 − 456 =
  3. 3.238 + 435 =
  4. 4.? − 250 = 108
  5. 5.A train has 490 people in the front coaches and 476 people in the back coaches. How many people are on the train?
  6. 6.331 + 345 =
  7. 7.A school has 328 children. 208 of them are girls. How many boys are there?
  8. 8.? + 563 = 830
  9. 9.A train has 277 people in the front coaches and 460 people in the back coaches. How many people are on the train?
  10. 10.A school has 717 children. 666 of them are girls. How many boys are there?
  11. 11.787 + 116 =
  12. 12.? + 723 = 966
  13. 13.322 + 387 =
  14. 14.768 − 225 =
  15. 15.A school has 624 children. 141 of them are girls. How many boys are there?
  16. 16.A school has 857 children. 734 of them are girls. How many boys are there?
  17. 17.? − 100 = 341
  18. 18.629 − 479 =
  19. 19.906 − ? = 110
  20. 20.? + 363 = 986
  21. 21.? − 225 = 25
  22. 22.? + 145 = 759
  23. 23.579 − 555 =
  24. 24.A school has 386 children. 274 of them are girls. How many boys are there?
  25. 25.503 − 117 =
  26. 26.604 − ? = 37
  27. 27.? − 228 = 229
  28. 28.697 − 278 =
  29. 29.A school has 263 children. 202 of them are girls. How many boys are there?
  30. 30.295 + 245 =
  31. 31.441 + 279 =
  32. 32.533 − 353 =
  33. 33.A train has 573 people in the front coaches and 258 people in the back coaches. How many people are on the train?
  34. 34.A train has 119 people in the front coaches and 781 people in the back coaches. How many people are on the train?
  35. 35.688 − 313 =
  36. 36.271 − ? = 3
  37. 37.? − 388 = 246
  38. 38.228 + ? = 611
  39. 39.A school has 465 children. 287 of them are girls. How many boys are there?
  40. 40.814 − 246 =

Answer key

  1. 124
  2. 145
  3. 673
  4. 358
  5. 966
  6. 676
  7. 120
  8. 267
  9. 737
  10. 51
  11. 903
  12. 243
  13. 709
  14. 543
  15. 483
  16. 123
  17. 441
  18. 150
  19. 796
  20. 623
  21. 250
  22. 614
  23. 24
  24. 112
  25. 386
  26. 567
  27. 457
  28. 419
  29. 61
  30. 540
  31. 720
  32. 180
  33. 831
  34. 900
  35. 375
  36. 268
  37. 634
  38. 383
  39. 178
  40. 568

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