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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 943 · 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. 1.174 + ? = 686
  2. 2.634 + 263 =
  3. 3.A school has 607 children. 122 of them are girls. How many boys are there?
  4. 4.? − 142 = 251
  5. 5.A school has 536 children. 270 of them are girls. How many boys are there?
  6. 6.A train has 873 people in the front coaches and 109 people in the back coaches. How many people are on the train?
  7. 7.333 − ? = 144
  8. 8.780 − ? = 29
  9. 9.? + 648 = 786
  10. 10.885 − 101 =
  11. 11.756 − 202 =
  12. 12.421 − 411 =
  13. 13.756 + 131 =
  14. 14.578 + 285 =
  15. 15.? + 161 = 870
  16. 16.521 − 289 =
  17. 17.A train has 436 people in the front coaches and 104 people in the back coaches. How many people are on the train?
  18. 18.219 − 174 =
  19. 19.A school has 440 children. 104 of them are girls. How many boys are there?
  20. 20.297 + 365 =
  21. 21.A train has 115 people in the front coaches and 354 people in the back coaches. How many people are on the train?
  22. 22.? − 138 = 150
  23. 23.702 + ? = 935
  24. 24.220 − 168 =
  25. 25.475 − ? = 169
  26. 26.323 − 191 =
  27. 27.A train has 398 people in the front coaches and 187 people in the back coaches. How many people are on the train?
  28. 28.289 − 247 =
  29. 29.242 + 234 =
  30. 30.925 − 197 =
  31. 31.A school has 202 children. 124 of them are girls. How many boys are there?
  32. 32.A school has 827 children. 374 of them are girls. How many boys are there?
  33. 33.853 − 603 =
  34. 34.474 + 185 =
  35. 35.? + 360 = 570
  36. 36.977 − ? = 457
  37. 37.A train has 153 people in the front coaches and 317 people in the back coaches. How many people are on the train?
  38. 38.463 − 354 =
  39. 39.A school has 790 children. 524 of them are girls. How many boys are there?
  40. 40.704 − ? = 178

Answer key

  1. 512
  2. 897
  3. 485
  4. 393
  5. 266
  6. 982
  7. 189
  8. 751
  9. 138
  10. 784
  11. 554
  12. 10
  13. 887
  14. 863
  15. 709
  16. 232
  17. 540
  18. 45
  19. 336
  20. 662
  21. 469
  22. 288
  23. 233
  24. 52
  25. 306
  26. 132
  27. 585
  28. 42
  29. 476
  30. 728
  31. 78
  32. 453
  33. 250
  34. 659
  35. 210
  36. 520
  37. 470
  38. 109
  39. 266
  40. 526

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