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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 106 · 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.? + 717 = 898
  2. 2.115 + ? = 848
  3. 3.A train has 506 people in the front coaches and 156 people in the back coaches. How many people are on the train?
  4. 4.A school has 697 children. 124 of them are girls. How many boys are there?
  5. 5.A school has 799 children. 202 of them are girls. How many boys are there?
  6. 6.A school has 315 children. 259 of them are girls. How many boys are there?
  7. 7.A train has 632 people in the front coaches and 149 people in the back coaches. How many people are on the train?
  8. 8.626 + 351 =
  9. 9.170 + 719 =
  10. 10.A school has 276 children. 191 of them are girls. How many boys are there?
  11. 11.223 + 527 =
  12. 12.A train has 178 people in the front coaches and 818 people in the back coaches. How many people are on the train?
  13. 13.? + 543 = 808
  14. 14.766 + ? = 878
  15. 15.A train has 692 people in the front coaches and 148 people in the back coaches. How many people are on the train?
  16. 16.? − 419 = 216
  17. 17.161 + ? = 681
  18. 18.227 + 379 =
  19. 19.A train has 146 people in the front coaches and 259 people in the back coaches. How many people are on the train?
  20. 20.A school has 931 children. 807 of them are girls. How many boys are there?
  21. 21.? − 470 = 76
  22. 22.337 − ? = 204
  23. 23.A train has 580 people in the front coaches and 137 people in the back coaches. How many people are on the train?
  24. 24.A train has 264 people in the front coaches and 605 people in the back coaches. How many people are on the train?
  25. 25.A school has 958 children. 202 of them are girls. How many boys are there?
  26. 26.? − 464 = 98
  27. 27.A school has 453 children. 210 of them are girls. How many boys are there?
  28. 28.A train has 164 people in the front coaches and 829 people in the back coaches. How many people are on the train?
  29. 29.936 − ? = 154
  30. 30.A train has 284 people in the front coaches and 518 people in the back coaches. How many people are on the train?
  31. 31.462 − 336 =
  32. 32.A school has 855 children. 601 of them are girls. How many boys are there?
  33. 33.A school has 887 children. 637 of them are girls. How many boys are there?
  34. 34.A train has 840 people in the front coaches and 136 people in the back coaches. How many people are on the train?
  35. 35.352 + 617 =
  36. 36.? + 883 = 999
  37. 37.A train has 228 people in the front coaches and 251 people in the back coaches. How many people are on the train?
  38. 38.222 − ? = 63
  39. 39.639 + 107 =
  40. 40.611 + 102 =

Answer key

  1. 181
  2. 733
  3. 662
  4. 573
  5. 597
  6. 56
  7. 781
  8. 977
  9. 889
  10. 85
  11. 750
  12. 996
  13. 265
  14. 112
  15. 840
  16. 635
  17. 520
  18. 606
  19. 405
  20. 124
  21. 546
  22. 133
  23. 717
  24. 869
  25. 756
  26. 562
  27. 243
  28. 993
  29. 782
  30. 802
  31. 126
  32. 254
  33. 250
  34. 976
  35. 969
  36. 116
  37. 479
  38. 159
  39. 746
  40. 713

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