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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 834 · 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. 1.757 + 221 =
  2. 2.881 + ? = 981
  3. 3.583 + 234 =
  4. 4.A train has 516 people in the front coaches and 143 people in the back coaches. How many people are on the train?
  5. 5.392 − 245 =
  6. 6.? − 325 = 421
  7. 7.260 − 207 =
  8. 8.205 − ? = 57
  9. 9.? + 816 = 940
  10. 10.264 + 449 =
  11. 11.239 − 110 =
  12. 12.? − 259 = 195
  13. 13.997 − 108 =
  14. 14.224 − 201 =
  15. 15.A train has 502 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  16. 16.838 + 109 =
  17. 17.746 + 142 =
  18. 18.? + 778 = 974
  19. 19.295 − 158 =
  20. 20.A school has 421 children. 130 of them are girls. How many boys are there?
  21. 21.A school has 889 children. 843 of them are girls. How many boys are there?
  22. 22.700 + 170 =
  23. 23.? + 608 = 990
  24. 24.A train has 493 people in the front coaches and 253 people in the back coaches. How many people are on the train?
  25. 25.A train has 420 people in the front coaches and 442 people in the back coaches. How many people are on the train?
  26. 26.322 + 421 =
  27. 27.346 − 129 =
  28. 28.267 − 145 =
  29. 29.A train has 146 people in the front coaches and 659 people in the back coaches. How many people are on the train?
  30. 30.144 + ? = 986
  31. 31.A train has 672 people in the front coaches and 303 people in the back coaches. How many people are on the train?
  32. 32.242 + 152 =
  33. 33.175 + 350 =
  34. 34.303 − ? = 52
  35. 35.102 + 207 =
  36. 36.A train has 391 people in the front coaches and 587 people in the back coaches. How many people are on the train?
  37. 37.902 − 364 =
  38. 38.739 + 253 =
  39. 39.713 − 576 =
  40. 40.704 + ? = 834

Answer key

  1. 978
  2. 100
  3. 817
  4. 659
  5. 147
  6. 746
  7. 53
  8. 148
  9. 124
  10. 713
  11. 129
  12. 454
  13. 889
  14. 23
  15. 606
  16. 947
  17. 888
  18. 196
  19. 137
  20. 291
  21. 46
  22. 870
  23. 382
  24. 746
  25. 862
  26. 743
  27. 217
  28. 122
  29. 805
  30. 842
  31. 975
  32. 394
  33. 525
  34. 251
  35. 309
  36. 978
  37. 538
  38. 992
  39. 137
  40. 130

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