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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 886 · 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. 1.558 − ? = 337
  2. 2.A school has 405 children. 206 of them are girls. How many boys are there?
  3. 3.? − 390 = 18
  4. 4.A school has 733 children. 654 of them are girls. How many boys are there?
  5. 5.A train has 235 people in the front coaches and 270 people in the back coaches. How many people are on the train?
  6. 6.A school has 692 children. 358 of them are girls. How many boys are there?
  7. 7.734 − 424 =
  8. 8.643 − ? = 316
  9. 9.652 + ? = 792
  10. 10.411 + 373 =
  11. 11.483 + 152 =
  12. 12.262 + 139 =
  13. 13.A school has 676 children. 578 of them are girls. How many boys are there?
  14. 14.A train has 526 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  15. 15.A school has 547 children. 237 of them are girls. How many boys are there?
  16. 16.361 − ? = 178
  17. 17.831 + 134 =
  18. 18.? + 473 = 601
  19. 19.838 + 110 =
  20. 20.238 + 136 =
  21. 21.A train has 395 people in the front coaches and 462 people in the back coaches. How many people are on the train?
  22. 22.129 + ? = 363
  23. 23.A train has 157 people in the front coaches and 489 people in the back coaches. How many people are on the train?
  24. 24.399 + 458 =
  25. 25.744 − 183 =
  26. 26.? − 421 = 95
  27. 27.A train has 170 people in the front coaches and 120 people in the back coaches. How many people are on the train?
  28. 28.853 + ? = 957
  29. 29.A train has 557 people in the front coaches and 328 people in the back coaches. How many people are on the train?
  30. 30.529 − ? = 391
  31. 31.? + 351 = 717
  32. 32.776 − ? = 133
  33. 33.329 − 191 =
  34. 34.974 − 519 =
  35. 35.430 + ? = 909
  36. 36.411 − 369 =
  37. 37.528 + 345 =
  38. 38.278 − ? = 36
  39. 39.A train has 683 people in the front coaches and 206 people in the back coaches. How many people are on the train?
  40. 40.? − 380 = 104

Answer key

  1. 221
  2. 199
  3. 408
  4. 79
  5. 505
  6. 334
  7. 310
  8. 327
  9. 140
  10. 784
  11. 635
  12. 401
  13. 98
  14. 631
  15. 310
  16. 183
  17. 965
  18. 128
  19. 948
  20. 374
  21. 857
  22. 234
  23. 646
  24. 857
  25. 561
  26. 516
  27. 290
  28. 104
  29. 885
  30. 138
  31. 366
  32. 643
  33. 138
  34. 455
  35. 479
  36. 42
  37. 873
  38. 242
  39. 889
  40. 484

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