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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 693 · 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. 1.148 + 19 =
  2. 2.378 + 27 =
  3. 3.494 + 49 =
  4. 4.60 + 87 =
  5. 5.62 + 38 =
  6. 6.116 + 67 =
  7. 7.372 + 87 =
  8. 8.326 + 78 =
  9. 9.80 + 27 =
  10. 10.424 + 49 =
  11. 11.70 + 67 =
  12. 12.271 + 49 =
  13. 13.111 + 38 =
  14. 14.267 + 37 =
  15. 15.186 + 98 =
  16. 16.156 + 59 =
  17. 17.52 + 67 =
  18. 18.237 + 78 =
  19. 19.414 + 88 =
  20. 20.38 + 79 =
  21. 21.181 + 27 =
  22. 22.261 + 68 =
  23. 23.309 + 88 =
  24. 24.208 + 57 =
  25. 25.474 + 88 =
  26. 26.318 + 77 =
  27. 27.154 + 39 =
  28. 28.216 + 27 =
  29. 29.120 + 87 =
  30. 30.187 + 69 =
  31. 31.85 + 78 =
  32. 32.380 + 48 =
  33. 33.464 + 78 =
  34. 34.25 + 89 =
  35. 35.146 + 59 =
  36. 36.433 + 99 =
  37. 37.72 + 78 =
  38. 38.352 + 68 =
  39. 39.477 + 78 =
  40. 40.50 + 28 =

Answer key

  1. 167
  2. 405
  3. 543
  4. 147
  5. 100
  6. 183
  7. 459
  8. 404
  9. 107
  10. 473
  11. 137
  12. 320
  13. 149
  14. 304
  15. 284
  16. 215
  17. 119
  18. 315
  19. 502
  20. 117
  21. 208
  22. 329
  23. 397
  24. 265
  25. 562
  26. 395
  27. 193
  28. 243
  29. 207
  30. 256
  31. 163
  32. 428
  33. 542
  34. 114
  35. 205
  36. 532
  37. 150
  38. 420
  39. 555
  40. 78

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