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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 384 · 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. 1.41 + 39 =
  2. 2.53 + 17 =
  3. 3.151 + 47 =
  4. 4.418 + 28 =
  5. 5.414 + 77 =
  6. 6.387 + 48 =
  7. 7.164 + 69 =
  8. 8.120 + 67 =
  9. 9.191 + 47 =
  10. 10.136 + 48 =
  11. 11.27 + 78 =
  12. 12.254 + 58 =
  13. 13.273 + 29 =
  14. 14.215 + 57 =
  15. 15.315 + 87 =
  16. 16.443 + 47 =
  17. 17.263 + 59 =
  18. 18.129 + 27 =
  19. 19.494 + 99 =
  20. 20.285 + 29 =
  21. 21.109 + 98 =
  22. 22.328 + 59 =
  23. 23.99 + 99 =
  24. 24.90 + 69 =
  25. 25.114 + 59 =
  26. 26.140 + 87 =
  27. 27.128 + 58 =
  28. 28.73 + 19 =
  29. 29.137 + 78 =
  30. 30.47 + 78 =
  31. 31.374 + 27 =
  32. 32.477 + 87 =
  33. 33.450 + 38 =
  34. 34.242 + 57 =
  35. 35.171 + 68 =
  36. 36.153 + 78 =
  37. 37.231 + 77 =
  38. 38.86 + 87 =
  39. 39.462 + 69 =
  40. 40.424 + 19 =

Answer key

  1. 80
  2. 70
  3. 198
  4. 446
  5. 491
  6. 435
  7. 233
  8. 187
  9. 238
  10. 184
  11. 105
  12. 312
  13. 302
  14. 272
  15. 402
  16. 490
  17. 322
  18. 156
  19. 593
  20. 314
  21. 207
  22. 387
  23. 198
  24. 159
  25. 173
  26. 227
  27. 186
  28. 92
  29. 215
  30. 125
  31. 401
  32. 564
  33. 488
  34. 299
  35. 239
  36. 231
  37. 308
  38. 173
  39. 531
  40. 443

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