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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 748 · 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 school has 299 children. 134 of them are girls. How many boys are there?
  2. 2.248 − 104 =
  3. 3.A school has 228 children. 126 of them are girls. How many boys are there?
  4. 4.346 − 204 =
  5. 5.? + 106 = 549
  6. 6.A school has 924 children. 267 of them are girls. How many boys are there?
  7. 7.340 + 359 =
  8. 8.? + 162 = 471
  9. 9.? − 146 = 651
  10. 10.282 − 267 =
  11. 11.A train has 347 people in the front coaches and 466 people in the back coaches. How many people are on the train?
  12. 12.A train has 291 people in the front coaches and 400 people in the back coaches. How many people are on the train?
  13. 13.A train has 527 people in the front coaches and 142 people in the back coaches. How many people are on the train?
  14. 14.A school has 930 children. 179 of them are girls. How many boys are there?
  15. 15.998 − 695 =
  16. 16.690 − ? = 226
  17. 17.A school has 993 children. 556 of them are girls. How many boys are there?
  18. 18.792 + 150 =
  19. 19.? + 312 = 424
  20. 20.897 − 439 =
  21. 21.868 − 778 =
  22. 22.A school has 846 children. 345 of them are girls. How many boys are there?
  23. 23.A school has 688 children. 166 of them are girls. How many boys are there?
  24. 24.226 + 546 =
  25. 25.413 − 157 =
  26. 26.A school has 980 children. 366 of them are girls. How many boys are there?
  27. 27.295 + ? = 509
  28. 28.A school has 200 children. 188 of them are girls. How many boys are there?
  29. 29.468 + ? = 815
  30. 30.? + 409 = 631
  31. 31.A train has 489 people in the front coaches and 108 people in the back coaches. How many people are on the train?
  32. 32.A school has 780 children. 310 of them are girls. How many boys are there?
  33. 33.818 + 126 =
  34. 34.A school has 918 children. 589 of them are girls. How many boys are there?
  35. 35.A train has 362 people in the front coaches and 228 people in the back coaches. How many people are on the train?
  36. 36.A school has 422 children. 100 of them are girls. How many boys are there?
  37. 37.300 − 275 =
  38. 38.570 + 255 =
  39. 39.A school has 721 children. 481 of them are girls. How many boys are there?
  40. 40.? + 413 = 575

Answer key

  1. 165
  2. 144
  3. 102
  4. 142
  5. 443
  6. 657
  7. 699
  8. 309
  9. 797
  10. 15
  11. 813
  12. 691
  13. 669
  14. 751
  15. 303
  16. 464
  17. 437
  18. 942
  19. 112
  20. 458
  21. 90
  22. 501
  23. 522
  24. 772
  25. 256
  26. 614
  27. 214
  28. 12
  29. 347
  30. 222
  31. 597
  32. 470
  33. 944
  34. 329
  35. 590
  36. 322
  37. 25
  38. 825
  39. 240
  40. 162

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