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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 889 · 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. 1.110 + 47 =
  2. 2.417 + 87 =
  3. 3.133 + 78 =
  4. 4.265 + 47 =
  5. 5.204 + 17 =
  6. 6.233 + 18 =
  7. 7.428 + 28 =
  8. 8.186 + 49 =
  9. 9.385 + 19 =
  10. 10.360 + 18 =
  11. 11.316 + 58 =
  12. 12.95 + 87 =
  13. 13.314 + 39 =
  14. 14.424 + 77 =
  15. 15.438 + 17 =
  16. 16.439 + 49 =
  17. 17.112 + 27 =
  18. 18.138 + 69 =
  19. 19.242 + 99 =
  20. 20.206 + 67 =
  21. 21.454 + 37 =
  22. 22.488 + 28 =
  23. 23.444 + 87 =
  24. 24.79 + 68 =
  25. 25.201 + 79 =
  26. 26.339 + 79 =
  27. 27.136 + 37 =
  28. 28.467 + 87 =
  29. 29.169 + 58 =
  30. 30.112 + 47 =
  31. 31.491 + 58 =
  32. 32.320 + 59 =
  33. 33.248 + 87 =
  34. 34.193 + 28 =
  35. 35.459 + 38 =
  36. 36.53 + 49 =
  37. 37.262 + 89 =
  38. 38.37 + 68 =
  39. 39.426 + 58 =
  40. 40.70 + 37 =

Answer key

  1. 157
  2. 504
  3. 211
  4. 312
  5. 221
  6. 251
  7. 456
  8. 235
  9. 404
  10. 378
  11. 374
  12. 182
  13. 353
  14. 501
  15. 455
  16. 488
  17. 139
  18. 207
  19. 341
  20. 273
  21. 491
  22. 516
  23. 531
  24. 147
  25. 280
  26. 418
  27. 173
  28. 554
  29. 227
  30. 159
  31. 549
  32. 379
  33. 335
  34. 221
  35. 497
  36. 102
  37. 351
  38. 105
  39. 484
  40. 107

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