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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 603 · 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. 1.712 − ? = 279
  2. 2.A school has 254 children. 120 of them are girls. How many boys are there?
  3. 3.658 + ? = 843
  4. 4.237 − 114 =
  5. 5.A train has 361 people in the front coaches and 182 people in the back coaches. How many people are on the train?
  6. 6.393 − ? = 140
  7. 7.379 − 176 =
  8. 8.193 + 487 =
  9. 9.628 − 159 =
  10. 10.? − 554 = 54
  11. 11.A train has 777 people in the front coaches and 173 people in the back coaches. How many people are on the train?
  12. 12.236 − ? = 68
  13. 13.? + 283 = 877
  14. 14.327 − 228 =
  15. 15.396 − 337 =
  16. 16.A train has 319 people in the front coaches and 654 people in the back coaches. How many people are on the train?
  17. 17.985 − 608 =
  18. 18.A train has 757 people in the front coaches and 176 people in the back coaches. How many people are on the train?
  19. 19.867 − ? = 700
  20. 20.288 − 140 =
  21. 21.585 + 410 =
  22. 22.667 + 181 =
  23. 23.A train has 850 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  24. 24.119 + ? = 490
  25. 25.323 + ? = 729
  26. 26.118 + ? = 744
  27. 27.? − 700 = 180
  28. 28.? + 873 = 995
  29. 29.967 − ? = 743
  30. 30.611 + 162 =
  31. 31.867 − 400 =
  32. 32.A train has 115 people in the front coaches and 197 people in the back coaches. How many people are on the train?
  33. 33.980 − 297 =
  34. 34.836 − ? = 235
  35. 35.576 + ? = 788
  36. 36.637 − 291 =
  37. 37.A train has 755 people in the front coaches and 222 people in the back coaches. How many people are on the train?
  38. 38.A train has 777 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  39. 39.201 − 155 =
  40. 40.? − 192 = 657

Answer key

  1. 433
  2. 134
  3. 185
  4. 123
  5. 543
  6. 253
  7. 203
  8. 680
  9. 469
  10. 608
  11. 950
  12. 168
  13. 594
  14. 99
  15. 59
  16. 973
  17. 377
  18. 933
  19. 167
  20. 148
  21. 995
  22. 848
  23. 956
  24. 371
  25. 406
  26. 626
  27. 880
  28. 122
  29. 224
  30. 773
  31. 467
  32. 312
  33. 683
  34. 601
  35. 212
  36. 346
  37. 977
  38. 930
  39. 46
  40. 849

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