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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 581 · 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. 1.587 − 412 =
  2. 2.A train has 649 people in the front coaches and 171 people in the back coaches. How many people are on the train?
  3. 3.847 − ? = 395
  4. 4.? + 414 = 792
  5. 5.864 + 122 =
  6. 6.? − 577 = 74
  7. 7.501 + 148 =
  8. 8.781 − 756 =
  9. 9.588 + ? = 875
  10. 10.A train has 640 people in the front coaches and 278 people in the back coaches. How many people are on the train?
  11. 11.A train has 421 people in the front coaches and 578 people in the back coaches. How many people are on the train?
  12. 12.703 + 229 =
  13. 13.A train has 173 people in the front coaches and 434 people in the back coaches. How many people are on the train?
  14. 14.741 − 668 =
  15. 15.806 + ? = 971
  16. 16.483 − 123 =
  17. 17.550 − ? = 203
  18. 18.328 + 587 =
  19. 19.A train has 590 people in the front coaches and 372 people in the back coaches. How many people are on the train?
  20. 20.148 + 712 =
  21. 21.732 − 344 =
  22. 22.A school has 761 children. 202 of them are girls. How many boys are there?
  23. 23.858 + ? = 965
  24. 24.499 − 402 =
  25. 25.? + 240 = 703
  26. 26.471 − ? = 328
  27. 27.607 − 166 =
  28. 28.A school has 308 children. 220 of them are girls. How many boys are there?
  29. 29.413 − 271 =
  30. 30.506 + 438 =
  31. 31.857 + 128 =
  32. 32.A train has 585 people in the front coaches and 361 people in the back coaches. How many people are on the train?
  33. 33.A school has 343 children. 179 of them are girls. How many boys are there?
  34. 34.? + 610 = 848
  35. 35.294 − ? = 96
  36. 36.952 − 498 =
  37. 37.231 + 646 =
  38. 38.? − 189 = 103
  39. 39.689 − ? = 379
  40. 40.250 − 224 =

Answer key

  1. 175
  2. 820
  3. 452
  4. 378
  5. 986
  6. 651
  7. 649
  8. 25
  9. 287
  10. 918
  11. 999
  12. 932
  13. 607
  14. 73
  15. 165
  16. 360
  17. 347
  18. 915
  19. 962
  20. 860
  21. 388
  22. 559
  23. 107
  24. 97
  25. 463
  26. 143
  27. 441
  28. 88
  29. 142
  30. 944
  31. 985
  32. 946
  33. 164
  34. 238
  35. 198
  36. 454
  37. 877
  38. 292
  39. 310
  40. 26

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