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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 184 · 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. 1.249 + 180 =
  2. 2.A train has 348 people in the front coaches and 312 people in the back coaches. How many people are on the train?
  3. 3.869 − ? = 544
  4. 4.A school has 837 children. 362 of them are girls. How many boys are there?
  5. 5.A train has 731 people in the front coaches and 233 people in the back coaches. How many people are on the train?
  6. 6.A school has 541 children. 432 of them are girls. How many boys are there?
  7. 7.241 − ? = 108
  8. 8.A school has 447 children. 171 of them are girls. How many boys are there?
  9. 9.373 + 399 =
  10. 10.A school has 614 children. 399 of them are girls. How many boys are there?
  11. 11.A school has 431 children. 272 of them are girls. How many boys are there?
  12. 12.556 − 220 =
  13. 13.A train has 716 people in the front coaches and 195 people in the back coaches. How many people are on the train?
  14. 14.214 − 179 =
  15. 15.508 − 442 =
  16. 16.? − 104 = 328
  17. 17.233 + ? = 934
  18. 18.644 − ? = 388
  19. 19.901 − 681 =
  20. 20.A train has 842 people in the front coaches and 157 people in the back coaches. How many people are on the train?
  21. 21.A train has 188 people in the front coaches and 693 people in the back coaches. How many people are on the train?
  22. 22.533 − ? = 261
  23. 23.638 − 125 =
  24. 24.A train has 651 people in the front coaches and 128 people in the back coaches. How many people are on the train?
  25. 25.602 − 362 =
  26. 26.? + 561 = 807
  27. 27.A school has 964 children. 932 of them are girls. How many boys are there?
  28. 28.A school has 507 children. 347 of them are girls. How many boys are there?
  29. 29.271 + 101 =
  30. 30.505 − 179 =
  31. 31.A train has 667 people in the front coaches and 177 people in the back coaches. How many people are on the train?
  32. 32.A train has 231 people in the front coaches and 418 people in the back coaches. How many people are on the train?
  33. 33.545 − 317 =
  34. 34.296 − 104 =
  35. 35.? + 390 = 498
  36. 36.579 + 143 =
  37. 37.835 − 360 =
  38. 38.A school has 924 children. 893 of them are girls. How many boys are there?
  39. 39.304 − 175 =
  40. 40.805 − 787 =

Answer key

  1. 429
  2. 660
  3. 325
  4. 475
  5. 964
  6. 109
  7. 133
  8. 276
  9. 772
  10. 215
  11. 159
  12. 336
  13. 911
  14. 35
  15. 66
  16. 432
  17. 701
  18. 256
  19. 220
  20. 999
  21. 881
  22. 272
  23. 513
  24. 779
  25. 240
  26. 246
  27. 32
  28. 160
  29. 372
  30. 326
  31. 844
  32. 649
  33. 228
  34. 192
  35. 108
  36. 722
  37. 475
  38. 31
  39. 129
  40. 18

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