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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 801 · 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. 1.349 + ? = 476
  2. 2.? + 740 = 977
  3. 3.A school has 743 children. 177 of them are girls. How many boys are there?
  4. 4.A school has 228 children. 103 of them are girls. How many boys are there?
  5. 5.A school has 407 children. 133 of them are girls. How many boys are there?
  6. 6.230 − ? = 78
  7. 7.707 + 119 =
  8. 8.845 − ? = 133
  9. 9.A train has 583 people in the front coaches and 324 people in the back coaches. How many people are on the train?
  10. 10.533 + 370 =
  11. 11.256 − 112 =
  12. 12.300 − ? = 94
  13. 13.A school has 368 children. 108 of them are girls. How many boys are there?
  14. 14.A train has 187 people in the front coaches and 121 people in the back coaches. How many people are on the train?
  15. 15.A school has 912 children. 327 of them are girls. How many boys are there?
  16. 16.A school has 355 children. 302 of them are girls. How many boys are there?
  17. 17.885 + 111 =
  18. 18.A train has 256 people in the front coaches and 271 people in the back coaches. How many people are on the train?
  19. 19.251 − 225 =
  20. 20.530 − 350 =
  21. 21.? + 106 = 757
  22. 22.A train has 365 people in the front coaches and 242 people in the back coaches. How many people are on the train?
  23. 23.? − 196 = 174
  24. 24.279 − 149 =
  25. 25.A school has 238 children. 141 of them are girls. How many boys are there?
  26. 26.899 + ? = 999
  27. 27.A train has 436 people in the front coaches and 355 people in the back coaches. How many people are on the train?
  28. 28.130 + ? = 440
  29. 29.842 + 101 =
  30. 30.A school has 808 children. 381 of them are girls. How many boys are there?
  31. 31.833 − 423 =
  32. 32.997 − 912 =
  33. 33.794 + 190 =
  34. 34.A school has 794 children. 775 of them are girls. How many boys are there?
  35. 35.A school has 755 children. 631 of them are girls. How many boys are there?
  36. 36.280 − 182 =
  37. 37.? − 111 = 109
  38. 38.A train has 264 people in the front coaches and 239 people in the back coaches. How many people are on the train?
  39. 39.340 − 245 =
  40. 40.442 + ? = 557

Answer key

  1. 127
  2. 237
  3. 566
  4. 125
  5. 274
  6. 152
  7. 826
  8. 712
  9. 907
  10. 903
  11. 144
  12. 206
  13. 260
  14. 308
  15. 585
  16. 53
  17. 996
  18. 527
  19. 26
  20. 180
  21. 651
  22. 607
  23. 370
  24. 130
  25. 97
  26. 100
  27. 791
  28. 310
  29. 943
  30. 427
  31. 410
  32. 85
  33. 984
  34. 19
  35. 124
  36. 98
  37. 220
  38. 503
  39. 95
  40. 115

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