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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 238 · 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 591 people in the front coaches and 347 people in the back coaches. How many people are on the train?
  2. 2.802 + 159 =
  3. 3.A train has 385 people in the front coaches and 590 people in the back coaches. How many people are on the train?
  4. 4.? − 223 = 144
  5. 5.444 + 274 =
  6. 6.574 − ? = 88
  7. 7.A school has 282 children. 222 of them are girls. How many boys are there?
  8. 8.A train has 851 people in the front coaches and 148 people in the back coaches. How many people are on the train?
  9. 9.A school has 399 children. 100 of them are girls. How many boys are there?
  10. 10.799 − ? = 232
  11. 11.? − 404 = 357
  12. 12.329 − ? = 105
  13. 13.? − 244 = 226
  14. 14.A school has 493 children. 374 of them are girls. How many boys are there?
  15. 15.445 + 475 =
  16. 16.793 − 213 =
  17. 17.428 − 331 =
  18. 18.298 + 559 =
  19. 19.995 − ? = 633
  20. 20.? + 313 = 795
  21. 21.679 − 560 =
  22. 22.921 − 797 =
  23. 23.390 − 119 =
  24. 24.? − 589 = 257
  25. 25.557 − 181 =
  26. 26.858 + ? = 974
  27. 27.A school has 458 children. 428 of them are girls. How many boys are there?
  28. 28.? + 107 = 784
  29. 29.? + 574 = 729
  30. 30.447 + 103 =
  31. 31.737 − ? = 635
  32. 32.? + 201 = 582
  33. 33.549 − 123 =
  34. 34.A school has 326 children. 283 of them are girls. How many boys are there?
  35. 35.A train has 472 people in the front coaches and 502 people in the back coaches. How many people are on the train?
  36. 36.? + 664 = 908
  37. 37.A train has 186 people in the front coaches and 324 people in the back coaches. How many people are on the train?
  38. 38.A train has 262 people in the front coaches and 115 people in the back coaches. How many people are on the train?
  39. 39.A train has 641 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  40. 40.245 − 217 =

Answer key

  1. 938
  2. 961
  3. 975
  4. 367
  5. 718
  6. 486
  7. 60
  8. 999
  9. 299
  10. 567
  11. 761
  12. 224
  13. 470
  14. 119
  15. 920
  16. 580
  17. 97
  18. 857
  19. 362
  20. 482
  21. 119
  22. 124
  23. 271
  24. 846
  25. 376
  26. 116
  27. 30
  28. 677
  29. 155
  30. 550
  31. 102
  32. 381
  33. 426
  34. 43
  35. 974
  36. 244
  37. 510
  38. 377
  39. 749
  40. 28

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