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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 806 · 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. 1.341 − 171 =
  2. 2.? + 635 = 902
  3. 3.528 + 204 =
  4. 4.A train has 734 people in the front coaches and 126 people in the back coaches. How many people are on the train?
  5. 5.A school has 505 children. 397 of them are girls. How many boys are there?
  6. 6.243 − ? = 20
  7. 7.802 − ? = 64
  8. 8.240 − 164 =
  9. 9.782 + 100 =
  10. 10.? − 188 = 160
  11. 11.A train has 745 people in the front coaches and 154 people in the back coaches. How many people are on the train?
  12. 12.A train has 579 people in the front coaches and 413 people in the back coaches. How many people are on the train?
  13. 13.A school has 343 children. 237 of them are girls. How many boys are there?
  14. 14.251 + 308 =
  15. 15.A school has 585 children. 450 of them are girls. How many boys are there?
  16. 16.376 − 328 =
  17. 17.? − 392 = 108
  18. 18.770 + 112 =
  19. 19.980 − ? = 298
  20. 20.814 − ? = 614
  21. 21.? − 529 = 33
  22. 22.314 + 679 =
  23. 23.A train has 692 people in the front coaches and 111 people in the back coaches. How many people are on the train?
  24. 24.758 − 683 =
  25. 25.180 + 816 =
  26. 26.121 + 625 =
  27. 27.? − 736 = 205
  28. 28.? − 198 = 452
  29. 29.A train has 148 people in the front coaches and 309 people in the back coaches. How many people are on the train?
  30. 30.271 + ? = 407
  31. 31.A train has 821 people in the front coaches and 155 people in the back coaches. How many people are on the train?
  32. 32.208 + ? = 487
  33. 33.? + 784 = 933
  34. 34.116 + ? = 489
  35. 35.A school has 444 children. 442 of them are girls. How many boys are there?
  36. 36.228 − ? = 32
  37. 37.273 + 177 =
  38. 38.A school has 617 children. 120 of them are girls. How many boys are there?
  39. 39.294 + ? = 651
  40. 40.A school has 496 children. 364 of them are girls. How many boys are there?

Answer key

  1. 170
  2. 267
  3. 732
  4. 860
  5. 108
  6. 223
  7. 738
  8. 76
  9. 882
  10. 348
  11. 899
  12. 992
  13. 106
  14. 559
  15. 135
  16. 48
  17. 500
  18. 882
  19. 682
  20. 200
  21. 562
  22. 993
  23. 803
  24. 75
  25. 996
  26. 746
  27. 941
  28. 650
  29. 457
  30. 136
  31. 976
  32. 279
  33. 149
  34. 373
  35. 2
  36. 196
  37. 450
  38. 497
  39. 357
  40. 132

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