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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 642 · 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.? + 109 = 930
  2. 2.604 + ? = 883
  3. 3.612 + 194 =
  4. 4.? + 618 = 828
  5. 5.470 − 318 =
  6. 6.A school has 613 children. 453 of them are girls. How many boys are there?
  7. 7.A school has 865 children. 765 of them are girls. How many boys are there?
  8. 8.? − 126 = 572
  9. 9.350 + 298 =
  10. 10.740 − 606 =
  11. 11.451 + 152 =
  12. 12.A school has 813 children. 593 of them are girls. How many boys are there?
  13. 13.A train has 892 people in the front coaches and 102 people in the back coaches. How many people are on the train?
  14. 14.140 + 785 =
  15. 15.674 + 119 =
  16. 16.693 − ? = 578
  17. 17.492 − 359 =
  18. 18.A train has 473 people in the front coaches and 253 people in the back coaches. How many people are on the train?
  19. 19.726 + 124 =
  20. 20.A school has 396 children. 272 of them are girls. How many boys are there?
  21. 21.452 − 347 =
  22. 22.A school has 911 children. 560 of them are girls. How many boys are there?
  23. 23.A train has 394 people in the front coaches and 500 people in the back coaches. How many people are on the train?
  24. 24.369 − 157 =
  25. 25.155 + ? = 320
  26. 26.682 − 531 =
  27. 27.434 + 114 =
  28. 28.415 − ? = 197
  29. 29.901 − 591 =
  30. 30.768 − ? = 617
  31. 31.A train has 760 people in the front coaches and 133 people in the back coaches. How many people are on the train?
  32. 32.242 + 509 =
  33. 33.608 − 578 =
  34. 34.493 − 460 =
  35. 35.309 − 133 =
  36. 36.A train has 437 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  37. 37.615 + 345 =
  38. 38.167 + 278 =
  39. 39.? − 350 = 46
  40. 40.320 + 444 =

Answer key

  1. 821
  2. 279
  3. 806
  4. 210
  5. 152
  6. 160
  7. 100
  8. 698
  9. 648
  10. 134
  11. 603
  12. 220
  13. 994
  14. 925
  15. 793
  16. 115
  17. 133
  18. 726
  19. 850
  20. 124
  21. 105
  22. 351
  23. 894
  24. 212
  25. 165
  26. 151
  27. 548
  28. 218
  29. 310
  30. 151
  31. 893
  32. 751
  33. 30
  34. 33
  35. 176
  36. 745
  37. 960
  38. 445
  39. 396
  40. 764

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