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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 821 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.489 + 47 =
  2. 2.268 + 27 =
  3. 3.28 + 37 =
  4. 4.323 + 58 =
  5. 5.228 + 49 =
  6. 6.30 + 37 =
  7. 7.157 + 87 =
  8. 8.135 + 18 =
  9. 9.247 + 28 =
  10. 10.233 + 67 =
  11. 11.366 + 69 =
  12. 12.473 + 89 =
  13. 13.148 + 29 =
  14. 14.355 + 79 =
  15. 15.203 + 48 =
  16. 16.262 + 37 =
  17. 17.274 + 48 =
  18. 18.428 + 88 =
  19. 19.230 + 47 =
  20. 20.30 + 67 =
  21. 21.272 + 27 =
  22. 22.161 + 17 =
  23. 23.449 + 18 =
  24. 24.87 + 99 =
  25. 25.409 + 49 =
  26. 26.489 + 97 =
  27. 27.86 + 19 =
  28. 28.141 + 17 =
  29. 29.426 + 17 =
  30. 30.365 + 79 =
  31. 31.56 + 99 =
  32. 32.41 + 49 =
  33. 33.96 + 89 =
  34. 34.345 + 99 =
  35. 35.128 + 28 =
  36. 36.274 + 38 =
  37. 37.175 + 28 =
  38. 38.458 + 17 =
  39. 39.166 + 27 =
  40. 40.429 + 99 =

Answer key

  1. 536
  2. 295
  3. 65
  4. 381
  5. 277
  6. 67
  7. 244
  8. 153
  9. 275
  10. 300
  11. 435
  12. 562
  13. 177
  14. 434
  15. 251
  16. 299
  17. 322
  18. 516
  19. 277
  20. 97
  21. 299
  22. 178
  23. 467
  24. 186
  25. 458
  26. 586
  27. 105
  28. 158
  29. 443
  30. 444
  31. 155
  32. 90
  33. 185
  34. 444
  35. 156
  36. 312
  37. 203
  38. 475
  39. 193
  40. 528

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