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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 326 · 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. 1.246 + 281 =
  2. 2.A train has 179 people in the front coaches and 294 people in the back coaches. How many people are on the train?
  3. 3.A train has 325 people in the front coaches and 153 people in the back coaches. How many people are on the train?
  4. 4.A train has 430 people in the front coaches and 327 people in the back coaches. How many people are on the train?
  5. 5.669 + ? = 782
  6. 6.956 − ? = 831
  7. 7.A school has 837 children. 502 of them are girls. How many boys are there?
  8. 8.473 − 176 =
  9. 9.480 + ? = 656
  10. 10.? − 420 = 272
  11. 11.A train has 165 people in the front coaches and 455 people in the back coaches. How many people are on the train?
  12. 12.A school has 576 children. 326 of them are girls. How many boys are there?
  13. 13.509 + 288 =
  14. 14.A school has 249 children. 203 of them are girls. How many boys are there?
  15. 15.? − 313 = 11
  16. 16.798 − ? = 57
  17. 17.A train has 816 people in the front coaches and 141 people in the back coaches. How many people are on the train?
  18. 18.? − 138 = 342
  19. 19.A school has 918 children. 672 of them are girls. How many boys are there?
  20. 20.? − 258 = 55
  21. 21.803 + 121 =
  22. 22.608 − 385 =
  23. 23.A train has 485 people in the front coaches and 131 people in the back coaches. How many people are on the train?
  24. 24.? − 322 = 219
  25. 25.814 + 142 =
  26. 26.? − 213 = 22
  27. 27.? + 476 = 587
  28. 28.145 + 511 =
  29. 29.784 − 592 =
  30. 30.188 + ? = 585
  31. 31.A school has 967 children. 684 of them are girls. How many boys are there?
  32. 32.A train has 148 people in the front coaches and 806 people in the back coaches. How many people are on the train?
  33. 33.A school has 709 children. 286 of them are girls. How many boys are there?
  34. 34.893 − ? = 664
  35. 35.A train has 773 people in the front coaches and 206 people in the back coaches. How many people are on the train?
  36. 36.443 − 434 =
  37. 37.? − 119 = 703
  38. 38.A train has 172 people in the front coaches and 482 people in the back coaches. How many people are on the train?
  39. 39.A school has 431 children. 395 of them are girls. How many boys are there?
  40. 40.? + 145 = 373

Answer key

  1. 527
  2. 473
  3. 478
  4. 757
  5. 113
  6. 125
  7. 335
  8. 297
  9. 176
  10. 692
  11. 620
  12. 250
  13. 797
  14. 46
  15. 324
  16. 741
  17. 957
  18. 480
  19. 246
  20. 313
  21. 924
  22. 223
  23. 616
  24. 541
  25. 956
  26. 235
  27. 111
  28. 656
  29. 192
  30. 397
  31. 283
  32. 954
  33. 423
  34. 229
  35. 979
  36. 9
  37. 822
  38. 654
  39. 36
  40. 228

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