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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 623 · 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.A train has 272 people in the front coaches and 308 people in the back coaches. How many people are on the train?
  2. 2.336 + 373 =
  3. 3.553 − 161 =
  4. 4.842 − 246 =
  5. 5.? + 300 = 821
  6. 6.A school has 638 children. 161 of them are girls. How many boys are there?
  7. 7.227 + 205 =
  8. 8.? + 700 = 884
  9. 9.447 + 399 =
  10. 10.632 + 201 =
  11. 11.330 − ? = 62
  12. 12.? + 428 = 641
  13. 13.395 + 139 =
  14. 14.A train has 181 people in the front coaches and 697 people in the back coaches. How many people are on the train?
  15. 15.161 + 717 =
  16. 16.? − 386 = 265
  17. 17.? + 730 = 879
  18. 18.837 − 642 =
  19. 19.? + 597 = 802
  20. 20.588 − ? = 234
  21. 21.247 − ? = 69
  22. 22.783 − 215 =
  23. 23.877 + 101 =
  24. 24.A train has 679 people in the front coaches and 117 people in the back coaches. How many people are on the train?
  25. 25.760 − ? = 570
  26. 26.885 − 739 =
  27. 27.? − 259 = 186
  28. 28.A train has 505 people in the front coaches and 180 people in the back coaches. How many people are on the train?
  29. 29.381 + ? = 667
  30. 30.781 + 134 =
  31. 31.586 + ? = 846
  32. 32.A train has 231 people in the front coaches and 518 people in the back coaches. How many people are on the train?
  33. 33.760 − 757 =
  34. 34.115 + 154 =
  35. 35.842 − 110 =
  36. 36.423 − 303 =
  37. 37.A school has 257 children. 194 of them are girls. How many boys are there?
  38. 38.A school has 665 children. 620 of them are girls. How many boys are there?
  39. 39.640 + ? = 880
  40. 40.A school has 438 children. 329 of them are girls. How many boys are there?

Answer key

  1. 580
  2. 709
  3. 392
  4. 596
  5. 521
  6. 477
  7. 432
  8. 184
  9. 846
  10. 833
  11. 268
  12. 213
  13. 534
  14. 878
  15. 878
  16. 651
  17. 149
  18. 195
  19. 205
  20. 354
  21. 178
  22. 568
  23. 978
  24. 796
  25. 190
  26. 146
  27. 445
  28. 685
  29. 286
  30. 915
  31. 260
  32. 749
  33. 3
  34. 269
  35. 732
  36. 120
  37. 63
  38. 45
  39. 240
  40. 109

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