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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 504 · 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. 1.565 + 118 =
  2. 2.868 + 120 =
  3. 3.? − 424 = 507
  4. 4.A school has 423 children. 422 of them are girls. How many boys are there?
  5. 5.404 − 341 =
  6. 6.A school has 786 children. 319 of them are girls. How many boys are there?
  7. 7.A school has 589 children. 142 of them are girls. How many boys are there?
  8. 8.? + 609 = 769
  9. 9.284 + 244 =
  10. 10.490 + ? = 859
  11. 11.136 + 644 =
  12. 12.A school has 268 children. 229 of them are girls. How many boys are there?
  13. 13.472 + 302 =
  14. 14.A school has 252 children. 178 of them are girls. How many boys are there?
  15. 15.? − 674 = 263
  16. 16.755 + 221 =
  17. 17.364 + 244 =
  18. 18.A school has 714 children. 293 of them are girls. How many boys are there?
  19. 19.796 + 192 =
  20. 20.626 + 150 =
  21. 21.A train has 124 people in the front coaches and 505 people in the back coaches. How many people are on the train?
  22. 22.? − 688 = 111
  23. 23.? − 313 = 25
  24. 24.498 − 272 =
  25. 25.A school has 340 children. 264 of them are girls. How many boys are there?
  26. 26.654 − ? = 290
  27. 27.? − 109 = 118
  28. 28.A school has 513 children. 149 of them are girls. How many boys are there?
  29. 29.? − 576 = 262
  30. 30.985 − 663 =
  31. 31.? + 216 = 412
  32. 32.365 − 137 =
  33. 33.156 + ? = 449
  34. 34.561 + ? = 999
  35. 35.351 + ? = 771
  36. 36.A school has 734 children. 552 of them are girls. How many boys are there?
  37. 37.248 − ? = 83
  38. 38.509 + 398 =
  39. 39.877 − 813 =
  40. 40.A school has 997 children. 838 of them are girls. How many boys are there?

Answer key

  1. 683
  2. 988
  3. 931
  4. 1
  5. 63
  6. 467
  7. 447
  8. 160
  9. 528
  10. 369
  11. 780
  12. 39
  13. 774
  14. 74
  15. 937
  16. 976
  17. 608
  18. 421
  19. 988
  20. 776
  21. 629
  22. 799
  23. 338
  24. 226
  25. 76
  26. 364
  27. 227
  28. 364
  29. 838
  30. 322
  31. 196
  32. 228
  33. 293
  34. 438
  35. 420
  36. 182
  37. 165
  38. 907
  39. 64
  40. 159

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