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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 231 · 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 231 people in the front coaches and 368 people in the back coaches. How many people are on the train?
  2. 2.856 + ? = 962
  3. 3.A train has 818 people in the front coaches and 160 people in the back coaches. How many people are on the train?
  4. 4.722 − ? = 133
  5. 5.722 + 212 =
  6. 6.421 + ? = 554
  7. 7.A train has 547 people in the front coaches and 139 people in the back coaches. How many people are on the train?
  8. 8.A school has 357 children. 312 of them are girls. How many boys are there?
  9. 9.268 + 413 =
  10. 10.A train has 409 people in the front coaches and 512 people in the back coaches. How many people are on the train?
  11. 11.? + 326 = 565
  12. 12.A school has 325 children. 259 of them are girls. How many boys are there?
  13. 13.? − 117 = 343
  14. 14.352 − ? = 243
  15. 15.355 + 117 =
  16. 16.935 − ? = 400
  17. 17.A train has 401 people in the front coaches and 592 people in the back coaches. How many people are on the train?
  18. 18.? + 679 = 909
  19. 19.A train has 337 people in the front coaches and 159 people in the back coaches. How many people are on the train?
  20. 20.A train has 639 people in the front coaches and 279 people in the back coaches. How many people are on the train?
  21. 21.A train has 855 people in the front coaches and 103 people in the back coaches. How many people are on the train?
  22. 22.A train has 718 people in the front coaches and 202 people in the back coaches. How many people are on the train?
  23. 23.585 − ? = 372
  24. 24.A school has 365 children. 266 of them are girls. How many boys are there?
  25. 25.317 + ? = 940
  26. 26.776 + 202 =
  27. 27.849 + 148 =
  28. 28.A train has 301 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  29. 29.178 + 406 =
  30. 30.A train has 475 people in the front coaches and 217 people in the back coaches. How many people are on the train?
  31. 31.A train has 505 people in the front coaches and 240 people in the back coaches. How many people are on the train?
  32. 32.143 + ? = 436
  33. 33.535 + 269 =
  34. 34.434 − 251 =
  35. 35.822 − 131 =
  36. 36.392 + ? = 782
  37. 37.A school has 537 children. 350 of them are girls. How many boys are there?
  38. 38.A school has 408 children. 399 of them are girls. How many boys are there?
  39. 39.? − 276 = 246
  40. 40.A school has 848 children. 776 of them are girls. How many boys are there?

Answer key

  1. 599
  2. 106
  3. 978
  4. 589
  5. 934
  6. 133
  7. 686
  8. 45
  9. 681
  10. 921
  11. 239
  12. 66
  13. 460
  14. 109
  15. 472
  16. 535
  17. 993
  18. 230
  19. 496
  20. 918
  21. 958
  22. 920
  23. 213
  24. 99
  25. 623
  26. 978
  27. 997
  28. 409
  29. 584
  30. 692
  31. 745
  32. 293
  33. 804
  34. 183
  35. 691
  36. 390
  37. 187
  38. 9
  39. 522
  40. 72

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