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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 497 · 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 368 people in the front coaches and 350 people in the back coaches. How many people are on the train?
  2. 2.638 − 573 =
  3. 3.A train has 869 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  4. 4.? − 354 = 355
  5. 5.A train has 508 people in the front coaches and 371 people in the back coaches. How many people are on the train?
  6. 6.A train has 198 people in the front coaches and 231 people in the back coaches. How many people are on the train?
  7. 7.672 − 240 =
  8. 8.942 − 411 =
  9. 9.348 + 308 =
  10. 10.? − 117 = 224
  11. 11.285 − 242 =
  12. 12.A train has 263 people in the front coaches and 614 people in the back coaches. How many people are on the train?
  13. 13.A school has 852 children. 180 of them are girls. How many boys are there?
  14. 14.A school has 773 children. 558 of them are girls. How many boys are there?
  15. 15.? − 153 = 86
  16. 16.? − 363 = 32
  17. 17.819 + 132 =
  18. 18.192 + ? = 574
  19. 19.? − 347 = 233
  20. 20.734 + 224 =
  21. 21.410 + 420 =
  22. 22.384 + 142 =
  23. 23.331 + ? = 684
  24. 24.818 − 698 =
  25. 25.203 − 152 =
  26. 26.714 − ? = 381
  27. 27.A school has 256 children. 223 of them are girls. How many boys are there?
  28. 28.? − 219 = 471
  29. 29.367 − 151 =
  30. 30.666 − 179 =
  31. 31.? + 138 = 502
  32. 32.A train has 556 people in the front coaches and 401 people in the back coaches. How many people are on the train?
  33. 33.? + 276 = 938
  34. 34.632 + 112 =
  35. 35.A train has 255 people in the front coaches and 487 people in the back coaches. How many people are on the train?
  36. 36.? + 377 = 684
  37. 37.? + 656 = 970
  38. 38.? + 837 = 979
  39. 39.336 − ? = 206
  40. 40.578 − 138 =

Answer key

  1. 718
  2. 65
  3. 999
  4. 709
  5. 879
  6. 429
  7. 432
  8. 531
  9. 656
  10. 341
  11. 43
  12. 877
  13. 672
  14. 215
  15. 239
  16. 395
  17. 951
  18. 382
  19. 580
  20. 958
  21. 830
  22. 526
  23. 353
  24. 120
  25. 51
  26. 333
  27. 33
  28. 690
  29. 216
  30. 487
  31. 364
  32. 957
  33. 662
  34. 744
  35. 742
  36. 307
  37. 314
  38. 142
  39. 130
  40. 440

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