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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 531 · 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. 1.303 − 233 =
  2. 2.805 − ? = 533
  3. 3.A train has 810 people in the front coaches and 116 people in the back coaches. How many people are on the train?
  4. 4.210 + 200 =
  5. 5.A train has 144 people in the front coaches and 802 people in the back coaches. How many people are on the train?
  6. 6.A school has 643 children. 621 of them are girls. How many boys are there?
  7. 7.A train has 327 people in the front coaches and 129 people in the back coaches. How many people are on the train?
  8. 8.A school has 988 children. 469 of them are girls. How many boys are there?
  9. 9.A school has 549 children. 507 of them are girls. How many boys are there?
  10. 10.? − 405 = 193
  11. 11.768 + 121 =
  12. 12.A train has 467 people in the front coaches and 130 people in the back coaches. How many people are on the train?
  13. 13.247 + 262 =
  14. 14.209 − 118 =
  15. 15.A school has 980 children. 115 of them are girls. How many boys are there?
  16. 16.840 + 106 =
  17. 17.? − 482 = 196
  18. 18.595 + 305 =
  19. 19.A train has 601 people in the front coaches and 187 people in the back coaches. How many people are on the train?
  20. 20.742 − 599 =
  21. 21.708 + ? = 816
  22. 22.A school has 856 children. 600 of them are girls. How many boys are there?
  23. 23.A train has 375 people in the front coaches and 369 people in the back coaches. How many people are on the train?
  24. 24.913 − ? = 278
  25. 25.729 − 146 =
  26. 26.A school has 604 children. 210 of them are girls. How many boys are there?
  27. 27.? + 547 = 786
  28. 28.640 − ? = 524
  29. 29.306 − ? = 6
  30. 30.? − 327 = 38
  31. 31.A train has 327 people in the front coaches and 296 people in the back coaches. How many people are on the train?
  32. 32.? − 139 = 128
  33. 33.182 + 635 =
  34. 34.A school has 981 children. 953 of them are girls. How many boys are there?
  35. 35.A train has 853 people in the front coaches and 124 people in the back coaches. How many people are on the train?
  36. 36.461 + 453 =
  37. 37.A train has 184 people in the front coaches and 429 people in the back coaches. How many people are on the train?
  38. 38.A train has 770 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  39. 39.490 + 140 =
  40. 40.? + 872 = 999

Answer key

  1. 70
  2. 272
  3. 926
  4. 410
  5. 946
  6. 22
  7. 456
  8. 519
  9. 42
  10. 598
  11. 889
  12. 597
  13. 509
  14. 91
  15. 865
  16. 946
  17. 678
  18. 900
  19. 788
  20. 143
  21. 108
  22. 256
  23. 744
  24. 635
  25. 583
  26. 394
  27. 239
  28. 116
  29. 300
  30. 365
  31. 623
  32. 267
  33. 817
  34. 28
  35. 977
  36. 914
  37. 613
  38. 887
  39. 630
  40. 127

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