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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 33 · 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. 1.804 − 698 =
  2. 2.305 + ? = 580
  3. 3.A school has 728 children. 533 of them are girls. How many boys are there?
  4. 4.A train has 118 people in the front coaches and 407 people in the back coaches. How many people are on the train?
  5. 5.A school has 889 children. 738 of them are girls. How many boys are there?
  6. 6.? − 235 = 32
  7. 7.A train has 889 people in the front coaches and 106 people in the back coaches. How many people are on the train?
  8. 8.A school has 827 children. 133 of them are girls. How many boys are there?
  9. 9.? − 751 = 18
  10. 10.141 + 142 =
  11. 11.323 + 155 =
  12. 12.264 − 204 =
  13. 13.251 + 384 =
  14. 14.A school has 677 children. 577 of them are girls. How many boys are there?
  15. 15.287 − 252 =
  16. 16.686 − 233 =
  17. 17.789 + 157 =
  18. 18.722 − ? = 504
  19. 19.419 + 459 =
  20. 20.? − 500 = 400
  21. 21.550 + 295 =
  22. 22.? − 134 = 311
  23. 23.744 + 208 =
  24. 24.584 − ? = 321
  25. 25.215 + 389 =
  26. 26.635 + 335 =
  27. 27.606 − ? = 448
  28. 28.890 + ? = 999
  29. 29.786 + 123 =
  30. 30.A train has 732 people in the front coaches and 144 people in the back coaches. How many people are on the train?
  31. 31.944 − 119 =
  32. 32.625 + 168 =
  33. 33.A school has 840 children. 543 of them are girls. How many boys are there?
  34. 34.219 − ? = 64
  35. 35.A school has 895 children. 320 of them are girls. How many boys are there?
  36. 36.A school has 278 children. 156 of them are girls. How many boys are there?
  37. 37.613 + 371 =
  38. 38.? + 138 = 908
  39. 39.233 + 128 =
  40. 40.363 − ? = 229

Answer key

  1. 106
  2. 275
  3. 195
  4. 525
  5. 151
  6. 267
  7. 995
  8. 694
  9. 769
  10. 283
  11. 478
  12. 60
  13. 635
  14. 100
  15. 35
  16. 453
  17. 946
  18. 218
  19. 878
  20. 900
  21. 845
  22. 445
  23. 952
  24. 263
  25. 604
  26. 970
  27. 158
  28. 109
  29. 909
  30. 876
  31. 825
  32. 793
  33. 297
  34. 155
  35. 575
  36. 122
  37. 984
  38. 770
  39. 361
  40. 134

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