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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 360 · 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. 1.400 + 345 =
  2. 2.? + 731 = 837
  3. 3.A train has 310 people in the front coaches and 620 people in the back coaches. How many people are on the train?
  4. 4.671 − 277 =
  5. 5.? + 102 = 448
  6. 6.273 − 265 =
  7. 7.869 − 377 =
  8. 8.A school has 359 children. 286 of them are girls. How many boys are there?
  9. 9.668 − 190 =
  10. 10.A school has 471 children. 380 of them are girls. How many boys are there?
  11. 11.517 + 278 =
  12. 12.A train has 584 people in the front coaches and 105 people in the back coaches. How many people are on the train?
  13. 13.A school has 369 children. 324 of them are girls. How many boys are there?
  14. 14.602 − ? = 140
  15. 15.A train has 288 people in the front coaches and 444 people in the back coaches. How many people are on the train?
  16. 16.316 + ? = 994
  17. 17.A train has 871 people in the front coaches and 123 people in the back coaches. How many people are on the train?
  18. 18.245 − ? = 80
  19. 19.593 + 167 =
  20. 20.A train has 696 people in the front coaches and 254 people in the back coaches. How many people are on the train?
  21. 21.A school has 877 children. 370 of them are girls. How many boys are there?
  22. 22.A school has 804 children. 214 of them are girls. How many boys are there?
  23. 23.364 + 108 =
  24. 24.? − 137 = 181
  25. 25.229 − 165 =
  26. 26.774 − 381 =
  27. 27.A school has 916 children. 724 of them are girls. How many boys are there?
  28. 28.680 − 263 =
  29. 29.755 + ? = 928
  30. 30.A train has 836 people in the front coaches and 148 people in the back coaches. How many people are on the train?
  31. 31.A school has 466 children. 257 of them are girls. How many boys are there?
  32. 32.? − 169 = 82
  33. 33.704 + 251 =
  34. 34.533 − 337 =
  35. 35.801 − 292 =
  36. 36.833 + 114 =
  37. 37.508 − 438 =
  38. 38.? + 204 = 539
  39. 39.? + 563 = 700
  40. 40.? − 123 = 869

Answer key

  1. 745
  2. 106
  3. 930
  4. 394
  5. 346
  6. 8
  7. 492
  8. 73
  9. 478
  10. 91
  11. 795
  12. 689
  13. 45
  14. 462
  15. 732
  16. 678
  17. 994
  18. 165
  19. 760
  20. 950
  21. 507
  22. 590
  23. 472
  24. 318
  25. 64
  26. 393
  27. 192
  28. 417
  29. 173
  30. 984
  31. 209
  32. 251
  33. 955
  34. 196
  35. 509
  36. 947
  37. 70
  38. 335
  39. 137
  40. 992

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