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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 898 · 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. 1.290 − 286 =
  2. 2.278 − ? = 152
  3. 3.420 − ? = 215
  4. 4.? + 894 = 998
  5. 5.208 − ? = 11
  6. 6.526 + ? = 682
  7. 7.A school has 279 children. 253 of them are girls. How many boys are there?
  8. 8.A school has 358 children. 231 of them are girls. How many boys are there?
  9. 9.A train has 334 people in the front coaches and 597 people in the back coaches. How many people are on the train?
  10. 10.882 − ? = 7
  11. 11.? − 269 = 581
  12. 12.? + 619 = 953
  13. 13.A train has 162 people in the front coaches and 295 people in the back coaches. How many people are on the train?
  14. 14.506 + ? = 619
  15. 15.? + 881 = 998
  16. 16.A train has 817 people in the front coaches and 112 people in the back coaches. How many people are on the train?
  17. 17.221 + 569 =
  18. 18.A school has 670 children. 640 of them are girls. How many boys are there?
  19. 19.852 + 114 =
  20. 20.A train has 849 people in the front coaches and 150 people in the back coaches. How many people are on the train?
  21. 21.? + 211 = 549
  22. 22.676 − 501 =
  23. 23.953 − 876 =
  24. 24.? − 457 = 182
  25. 25.344 − 172 =
  26. 26.? − 132 = 333
  27. 27.A train has 384 people in the front coaches and 521 people in the back coaches. How many people are on the train?
  28. 28.A train has 582 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  29. 29.390 − 272 =
  30. 30.A train has 603 people in the front coaches and 285 people in the back coaches. How many people are on the train?
  31. 31.461 − 244 =
  32. 32.? − 445 = 35
  33. 33.301 − 109 =
  34. 34.? − 113 = 131
  35. 35.A train has 628 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  36. 36.A school has 302 children. 202 of them are girls. How many boys are there?
  37. 37.? − 292 = 164
  38. 38.352 − 222 =
  39. 39.695 − 651 =
  40. 40.200 − 196 =

Answer key

  1. 4
  2. 126
  3. 205
  4. 104
  5. 197
  6. 156
  7. 26
  8. 127
  9. 931
  10. 875
  11. 850
  12. 334
  13. 457
  14. 113
  15. 117
  16. 929
  17. 790
  18. 30
  19. 966
  20. 999
  21. 338
  22. 175
  23. 77
  24. 639
  25. 172
  26. 465
  27. 905
  28. 699
  29. 118
  30. 888
  31. 217
  32. 480
  33. 192
  34. 244
  35. 781
  36. 100
  37. 456
  38. 130
  39. 44
  40. 4

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