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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 66 · 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. 1.472 + 17 =
  2. 2.163 + 18 =
  3. 3.57 + 98 =
  4. 4.298 + 58 =
  5. 5.27 + 37 =
  6. 6.160 + 97 =
  7. 7.384 + 99 =
  8. 8.123 + 27 =
  9. 9.136 + 59 =
  10. 10.439 + 39 =
  11. 11.125 + 98 =
  12. 12.330 + 38 =
  13. 13.359 + 59 =
  14. 14.310 + 69 =
  15. 15.96 + 48 =
  16. 16.465 + 27 =
  17. 17.38 + 19 =
  18. 18.242 + 79 =
  19. 19.252 + 69 =
  20. 20.186 + 68 =
  21. 21.232 + 29 =
  22. 22.61 + 39 =
  23. 23.155 + 39 =
  24. 24.434 + 39 =
  25. 25.482 + 78 =
  26. 26.416 + 77 =
  27. 27.259 + 28 =
  28. 28.41 + 27 =
  29. 29.64 + 49 =
  30. 30.144 + 87 =
  31. 31.398 + 59 =
  32. 32.122 + 39 =
  33. 33.140 + 49 =
  34. 34.451 + 99 =
  35. 35.194 + 47 =
  36. 36.356 + 99 =
  37. 37.202 + 29 =
  38. 38.58 + 18 =
  39. 39.457 + 58 =
  40. 40.493 + 19 =

Answer key

  1. 489
  2. 181
  3. 155
  4. 356
  5. 64
  6. 257
  7. 483
  8. 150
  9. 195
  10. 478
  11. 223
  12. 368
  13. 418
  14. 379
  15. 144
  16. 492
  17. 57
  18. 321
  19. 321
  20. 254
  21. 261
  22. 100
  23. 194
  24. 473
  25. 560
  26. 493
  27. 287
  28. 68
  29. 113
  30. 231
  31. 457
  32. 161
  33. 189
  34. 550
  35. 241
  36. 455
  37. 231
  38. 76
  39. 515
  40. 512

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