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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 281 · 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. 1.590 + ? = 862
  2. 2.400 − 168 =
  3. 3.844 + ? = 970
  4. 4.? + 609 = 734
  5. 5.617 + 198 =
  6. 6.550 + 342 =
  7. 7.603 + 110 =
  8. 8.A school has 430 children. 151 of them are girls. How many boys are there?
  9. 9.? + 288 = 863
  10. 10.A train has 287 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  11. 11.? + 322 = 732
  12. 12.495 − 312 =
  13. 13.? − 296 = 343
  14. 14.A train has 588 people in the front coaches and 344 people in the back coaches. How many people are on the train?
  15. 15.? − 250 = 689
  16. 16.A train has 455 people in the front coaches and 352 people in the back coaches. How many people are on the train?
  17. 17.? + 893 = 998
  18. 18.A school has 387 children. 331 of them are girls. How many boys are there?
  19. 19.344 − 275 =
  20. 20.501 − 468 =
  21. 21.898 + ? = 999
  22. 22.A train has 384 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  23. 23.585 + ? = 719
  24. 24.A train has 225 people in the front coaches and 310 people in the back coaches. How many people are on the train?
  25. 25.A school has 687 children. 450 of them are girls. How many boys are there?
  26. 26.683 + ? = 885
  27. 27.A train has 232 people in the front coaches and 415 people in the back coaches. How many people are on the train?
  28. 28.987 − 667 =
  29. 29.301 + 230 =
  30. 30.? + 109 = 376
  31. 31.A school has 920 children. 441 of them are girls. How many boys are there?
  32. 32.523 + 252 =
  33. 33.453 + ? = 934
  34. 34.337 − 208 =
  35. 35.610 − ? = 364
  36. 36.A train has 626 people in the front coaches and 252 people in the back coaches. How many people are on the train?
  37. 37.613 − 346 =
  38. 38.A school has 465 children. 194 of them are girls. How many boys are there?
  39. 39.A school has 448 children. 385 of them are girls. How many boys are there?
  40. 40.548 + ? = 654

Answer key

  1. 272
  2. 232
  3. 126
  4. 125
  5. 815
  6. 892
  7. 713
  8. 279
  9. 575
  10. 458
  11. 410
  12. 183
  13. 639
  14. 932
  15. 939
  16. 807
  17. 105
  18. 56
  19. 69
  20. 33
  21. 101
  22. 504
  23. 134
  24. 535
  25. 237
  26. 202
  27. 647
  28. 320
  29. 531
  30. 267
  31. 479
  32. 775
  33. 481
  34. 129
  35. 246
  36. 878
  37. 267
  38. 271
  39. 63
  40. 106

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