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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 560 · 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. 1.95 + 48 =
  2. 2.350 + 49 =
  3. 3.101 + 69 =
  4. 4.137 + 39 =
  5. 5.377 + 37 =
  6. 6.109 + 19 =
  7. 7.59 + 68 =
  8. 8.228 + 79 =
  9. 9.364 + 28 =
  10. 10.74 + 87 =
  11. 11.387 + 19 =
  12. 12.41 + 27 =
  13. 13.361 + 38 =
  14. 14.240 + 77 =
  15. 15.68 + 57 =
  16. 16.430 + 27 =
  17. 17.125 + 47 =
  18. 18.485 + 79 =
  19. 19.67 + 79 =
  20. 20.347 + 47 =
  21. 21.85 + 77 =
  22. 22.91 + 29 =
  23. 23.299 + 48 =
  24. 24.417 + 69 =
  25. 25.74 + 48 =
  26. 26.463 + 79 =
  27. 27.220 + 67 =
  28. 28.360 + 49 =
  29. 29.194 + 78 =
  30. 30.123 + 18 =
  31. 31.299 + 58 =
  32. 32.134 + 19 =
  33. 33.216 + 38 =
  34. 34.31 + 78 =
  35. 35.73 + 48 =
  36. 36.68 + 29 =
  37. 37.211 + 79 =
  38. 38.447 + 38 =
  39. 39.237 + 89 =
  40. 40.154 + 38 =

Answer key

  1. 143
  2. 399
  3. 170
  4. 176
  5. 414
  6. 128
  7. 127
  8. 307
  9. 392
  10. 161
  11. 406
  12. 68
  13. 399
  14. 317
  15. 125
  16. 457
  17. 172
  18. 564
  19. 146
  20. 394
  21. 162
  22. 120
  23. 347
  24. 486
  25. 122
  26. 542
  27. 287
  28. 409
  29. 272
  30. 141
  31. 357
  32. 153
  33. 254
  34. 109
  35. 121
  36. 97
  37. 290
  38. 485
  39. 326
  40. 192

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