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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 664 · 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. 1.61 + 28 =
  2. 2.86 + 17 =
  3. 3.313 + 47 =
  4. 4.272 + 17 =
  5. 5.260 + 87 =
  6. 6.95 + 78 =
  7. 7.218 + 18 =
  8. 8.179 + 18 =
  9. 9.40 + 88 =
  10. 10.88 + 57 =
  11. 11.161 + 87 =
  12. 12.42 + 97 =
  13. 13.147 + 18 =
  14. 14.477 + 28 =
  15. 15.276 + 87 =
  16. 16.92 + 27 =
  17. 17.374 + 58 =
  18. 18.318 + 47 =
  19. 19.165 + 79 =
  20. 20.147 + 68 =
  21. 21.421 + 98 =
  22. 22.91 + 28 =
  23. 23.125 + 48 =
  24. 24.461 + 67 =
  25. 25.98 + 77 =
  26. 26.304 + 17 =
  27. 27.252 + 59 =
  28. 28.66 + 98 =
  29. 29.342 + 17 =
  30. 30.495 + 67 =
  31. 31.249 + 89 =
  32. 32.368 + 19 =
  33. 33.114 + 67 =
  34. 34.406 + 17 =
  35. 35.125 + 79 =
  36. 36.262 + 19 =
  37. 37.174 + 49 =
  38. 38.243 + 19 =
  39. 39.229 + 39 =
  40. 40.62 + 28 =

Answer key

  1. 89
  2. 103
  3. 360
  4. 289
  5. 347
  6. 173
  7. 236
  8. 197
  9. 128
  10. 145
  11. 248
  12. 139
  13. 165
  14. 505
  15. 363
  16. 119
  17. 432
  18. 365
  19. 244
  20. 215
  21. 519
  22. 119
  23. 173
  24. 528
  25. 175
  26. 321
  27. 311
  28. 164
  29. 359
  30. 562
  31. 338
  32. 387
  33. 181
  34. 423
  35. 204
  36. 281
  37. 223
  38. 262
  39. 268
  40. 90

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