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Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 939 · 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 train has 376 people in the front coaches and 560 people in the back coaches. How many people are on the train?
  2. 2.712 + 199 =
  3. 3.? − 709 = 278
  4. 4.702 + 206 =
  5. 5.473 − 445 =
  6. 6.733 − ? = 309
  7. 7.A train has 602 people in the front coaches and 370 people in the back coaches. How many people are on the train?
  8. 8.388 − 225 =
  9. 9.A train has 258 people in the front coaches and 241 people in the back coaches. How many people are on the train?
  10. 10.462 + 399 =
  11. 11.753 − 669 =
  12. 12.712 − 586 =
  13. 13.A school has 782 children. 358 of them are girls. How many boys are there?
  14. 14.A train has 236 people in the front coaches and 373 people in the back coaches. How many people are on the train?
  15. 15.563 + ? = 904
  16. 16.? − 253 = 555
  17. 17.886 − 443 =
  18. 18.863 − 705 =
  19. 19.? + 832 = 970
  20. 20.406 − 210 =
  21. 21.A train has 199 people in the front coaches and 554 people in the back coaches. How many people are on the train?
  22. 22.584 + 144 =
  23. 23.A school has 300 children. 179 of them are girls. How many boys are there?
  24. 24.? − 400 = 540
  25. 25.A train has 330 people in the front coaches and 607 people in the back coaches. How many people are on the train?
  26. 26.259 − 240 =
  27. 27.573 + 142 =
  28. 28.? + 261 = 960
  29. 29.526 + ? = 974
  30. 30.A school has 897 children. 590 of them are girls. How many boys are there?
  31. 31.619 + ? = 913
  32. 32.540 − 480 =
  33. 33.A train has 252 people in the front coaches and 420 people in the back coaches. How many people are on the train?
  34. 34.297 − 106 =
  35. 35.123 + 801 =
  36. 36.955 − 496 =
  37. 37.278 + 631 =
  38. 38.? + 837 = 968
  39. 39.499 + 197 =
  40. 40.? + 175 = 297

Answer key

  1. 936
  2. 911
  3. 987
  4. 908
  5. 28
  6. 424
  7. 972
  8. 163
  9. 499
  10. 861
  11. 84
  12. 126
  13. 424
  14. 609
  15. 341
  16. 808
  17. 443
  18. 158
  19. 138
  20. 196
  21. 753
  22. 728
  23. 121
  24. 940
  25. 937
  26. 19
  27. 715
  28. 699
  29. 448
  30. 307
  31. 294
  32. 60
  33. 672
  34. 191
  35. 924
  36. 459
  37. 909
  38. 131
  39. 696
  40. 122

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