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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 372 · 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. 1.167 + 829 =
  2. 2.716 + 281 =
  3. 3.A train has 896 people in the front coaches and 100 people in the back coaches. How many people are on the train?
  4. 4.A train has 513 people in the front coaches and 107 people in the back coaches. How many people are on the train?
  5. 5.703 − 194 =
  6. 6.? + 698 = 831
  7. 7.570 + 155 =
  8. 8.250 − ? = 86
  9. 9.630 + 143 =
  10. 10.? − 170 = 203
  11. 11.311 − ? = 57
  12. 12.A school has 474 children. 145 of them are girls. How many boys are there?
  13. 13.180 + 371 =
  14. 14.986 − 551 =
  15. 15.807 − ? = 669
  16. 16.A school has 983 children. 474 of them are girls. How many boys are there?
  17. 17.? − 125 = 195
  18. 18.202 + 237 =
  19. 19.917 − ? = 12
  20. 20.182 + 557 =
  21. 21.? + 205 = 838
  22. 22.? − 230 = 135
  23. 23.A train has 361 people in the front coaches and 628 people in the back coaches. How many people are on the train?
  24. 24.A school has 758 children. 472 of them are girls. How many boys are there?
  25. 25.880 + 106 =
  26. 26.A school has 374 children. 277 of them are girls. How many boys are there?
  27. 27.A train has 652 people in the front coaches and 276 people in the back coaches. How many people are on the train?
  28. 28.864 + 117 =
  29. 29.563 − 313 =
  30. 30.A train has 543 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  31. 31.890 + 104 =
  32. 32.218 + 372 =
  33. 33.514 + 351 =
  34. 34.? − 516 = 203
  35. 35.614 − 522 =
  36. 36.270 + 622 =
  37. 37.? − 215 = 281
  38. 38.522 + 230 =
  39. 39.? + 570 = 763
  40. 40.A train has 634 people in the front coaches and 344 people in the back coaches. How many people are on the train?

Answer key

  1. 996
  2. 997
  3. 996
  4. 620
  5. 509
  6. 133
  7. 725
  8. 164
  9. 773
  10. 373
  11. 254
  12. 329
  13. 551
  14. 435
  15. 138
  16. 509
  17. 320
  18. 439
  19. 905
  20. 739
  21. 633
  22. 365
  23. 989
  24. 286
  25. 986
  26. 97
  27. 928
  28. 981
  29. 250
  30. 673
  31. 994
  32. 590
  33. 865
  34. 719
  35. 92
  36. 892
  37. 496
  38. 752
  39. 193
  40. 978

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