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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 433 · 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 school has 407 children. 387 of them are girls. How many boys are there?
  2. 2.348 + 635 =
  3. 3.A school has 808 children. 806 of them are girls. How many boys are there?
  4. 4.? − 156 = 133
  5. 5.305 − ? = 81
  6. 6.750 + ? = 926
  7. 7.A school has 336 children. 170 of them are girls. How many boys are there?
  8. 8.? − 554 = 191
  9. 9.732 − 614 =
  10. 10.806 + ? = 913
  11. 11.967 − ? = 807
  12. 12.A train has 115 people in the front coaches and 295 people in the back coaches. How many people are on the train?
  13. 13.A train has 425 people in the front coaches and 213 people in the back coaches. How many people are on the train?
  14. 14.A school has 866 children. 713 of them are girls. How many boys are there?
  15. 15.222 + 425 =
  16. 16.680 + ? = 864
  17. 17.A train has 734 people in the front coaches and 209 people in the back coaches. How many people are on the train?
  18. 18.929 − 512 =
  19. 19.? + 626 = 792
  20. 20.796 − 305 =
  21. 21.? − 498 = 249
  22. 22.A train has 356 people in the front coaches and 278 people in the back coaches. How many people are on the train?
  23. 23.? + 323 = 576
  24. 24.245 + 119 =
  25. 25.255 + 265 =
  26. 26.427 + 558 =
  27. 27.? − 530 = 63
  28. 28.734 + 148 =
  29. 29.? + 550 = 899
  30. 30.629 + 177 =
  31. 31.A train has 496 people in the front coaches and 363 people in the back coaches. How many people are on the train?
  32. 32.A school has 618 children. 248 of them are girls. How many boys are there?
  33. 33.829 + 143 =
  34. 34.748 + 148 =
  35. 35.632 + ? = 887
  36. 36.? − 443 = 511
  37. 37.384 + 208 =
  38. 38.784 + 133 =
  39. 39.148 + 235 =
  40. 40.A train has 446 people in the front coaches and 229 people in the back coaches. How many people are on the train?

Answer key

  1. 20
  2. 983
  3. 2
  4. 289
  5. 224
  6. 176
  7. 166
  8. 745
  9. 118
  10. 107
  11. 160
  12. 410
  13. 638
  14. 153
  15. 647
  16. 184
  17. 943
  18. 417
  19. 166
  20. 491
  21. 747
  22. 634
  23. 253
  24. 364
  25. 520
  26. 985
  27. 593
  28. 882
  29. 349
  30. 806
  31. 859
  32. 370
  33. 972
  34. 896
  35. 255
  36. 954
  37. 592
  38. 917
  39. 383
  40. 675

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