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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 861 · 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. 1.400 + 311 =
  2. 2.A train has 392 people in the front coaches and 533 people in the back coaches. How many people are on the train?
  3. 3.197 + 451 =
  4. 4.472 − 102 =
  5. 5.A train has 869 people in the front coaches and 122 people in the back coaches. How many people are on the train?
  6. 6.A train has 198 people in the front coaches and 291 people in the back coaches. How many people are on the train?
  7. 7.A school has 669 children. 649 of them are girls. How many boys are there?
  8. 8.? + 250 = 422
  9. 9.316 − ? = 29
  10. 10.A school has 834 children. 305 of them are girls. How many boys are there?
  11. 11.? + 498 = 704
  12. 12.A train has 342 people in the front coaches and 417 people in the back coaches. How many people are on the train?
  13. 13.A train has 151 people in the front coaches and 826 people in the back coaches. How many people are on the train?
  14. 14.? − 261 = 608
  15. 15.A school has 806 children. 646 of them are girls. How many boys are there?
  16. 16.276 + 340 =
  17. 17.A train has 106 people in the front coaches and 303 people in the back coaches. How many people are on the train?
  18. 18.894 + ? = 997
  19. 19.803 + 121 =
  20. 20.629 − 369 =
  21. 21.A school has 801 children. 118 of them are girls. How many boys are there?
  22. 22.285 + 502 =
  23. 23.? + 384 = 586
  24. 24.A school has 516 children. 226 of them are girls. How many boys are there?
  25. 25.A school has 952 children. 697 of them are girls. How many boys are there?
  26. 26.A school has 859 children. 100 of them are girls. How many boys are there?
  27. 27.? + 535 = 965
  28. 28.488 + 354 =
  29. 29.665 − 389 =
  30. 30.385 − 286 =
  31. 31.786 + 199 =
  32. 32.627 − 289 =
  33. 33.684 + ? = 929
  34. 34.A school has 953 children. 599 of them are girls. How many boys are there?
  35. 35.A school has 410 children. 136 of them are girls. How many boys are there?
  36. 36.579 + 179 =
  37. 37.305 + ? = 790
  38. 38.255 + 641 =
  39. 39.206 + 630 =
  40. 40.315 − ? = 42

Answer key

  1. 711
  2. 925
  3. 648
  4. 370
  5. 991
  6. 489
  7. 20
  8. 172
  9. 287
  10. 529
  11. 206
  12. 759
  13. 977
  14. 869
  15. 160
  16. 616
  17. 409
  18. 103
  19. 924
  20. 260
  21. 683
  22. 787
  23. 202
  24. 290
  25. 255
  26. 759
  27. 430
  28. 842
  29. 276
  30. 99
  31. 985
  32. 338
  33. 245
  34. 354
  35. 274
  36. 758
  37. 485
  38. 896
  39. 836
  40. 273

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