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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 989 · 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. 1.479 + ? = 845
  2. 2.A train has 186 people in the front coaches and 402 people in the back coaches. How many people are on the train?
  3. 3.? − 217 = 302
  4. 4.430 − ? = 261
  5. 5.A train has 192 people in the front coaches and 526 people in the back coaches. How many people are on the train?
  6. 6.379 − 287 =
  7. 7.? + 803 = 937
  8. 8.156 + 288 =
  9. 9.415 + 581 =
  10. 10.365 − 112 =
  11. 11.791 + ? = 919
  12. 12.A school has 234 children. 164 of them are girls. How many boys are there?
  13. 13.A school has 513 children. 202 of them are girls. How many boys are there?
  14. 14.187 + 713 =
  15. 15.A school has 818 children. 607 of them are girls. How many boys are there?
  16. 16.464 + 173 =
  17. 17.935 − 265 =
  18. 18.185 + 711 =
  19. 19.922 − 414 =
  20. 20.A train has 554 people in the front coaches and 290 people in the back coaches. How many people are on the train?
  21. 21.A train has 743 people in the front coaches and 214 people in the back coaches. How many people are on the train?
  22. 22.? − 209 = 667
  23. 23.517 − 458 =
  24. 24.294 − 220 =
  25. 25.381 − ? = 218
  26. 26.718 + ? = 946
  27. 27.A school has 572 children. 220 of them are girls. How many boys are there?
  28. 28.386 + ? = 545
  29. 29.892 − ? = 207
  30. 30.? − 268 = 350
  31. 31.270 − 156 =
  32. 32.A train has 295 people in the front coaches and 176 people in the back coaches. How many people are on the train?
  33. 33.125 + 154 =
  34. 34.609 + 140 =
  35. 35.A train has 429 people in the front coaches and 167 people in the back coaches. How many people are on the train?
  36. 36.386 − 106 =
  37. 37.780 − 776 =
  38. 38.? + 427 = 901
  39. 39.A train has 835 people in the front coaches and 125 people in the back coaches. How many people are on the train?
  40. 40.A train has 689 people in the front coaches and 196 people in the back coaches. How many people are on the train?

Answer key

  1. 366
  2. 588
  3. 519
  4. 169
  5. 718
  6. 92
  7. 134
  8. 444
  9. 996
  10. 253
  11. 128
  12. 70
  13. 311
  14. 900
  15. 211
  16. 637
  17. 670
  18. 896
  19. 508
  20. 844
  21. 957
  22. 876
  23. 59
  24. 74
  25. 163
  26. 228
  27. 352
  28. 159
  29. 685
  30. 618
  31. 114
  32. 471
  33. 279
  34. 749
  35. 596
  36. 280
  37. 4
  38. 474
  39. 960
  40. 885

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