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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 981 · 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. 1.387 + 49 =
  2. 2.365 + 98 =
  3. 3.145 + 67 =
  4. 4.441 + 38 =
  5. 5.56 + 39 =
  6. 6.150 + 17 =
  7. 7.365 + 18 =
  8. 8.69 + 77 =
  9. 9.238 + 48 =
  10. 10.176 + 28 =
  11. 11.58 + 17 =
  12. 12.206 + 79 =
  13. 13.270 + 58 =
  14. 14.269 + 87 =
  15. 15.86 + 18 =
  16. 16.65 + 78 =
  17. 17.340 + 99 =
  18. 18.217 + 89 =
  19. 19.472 + 29 =
  20. 20.218 + 19 =
  21. 21.334 + 27 =
  22. 22.112 + 59 =
  23. 23.269 + 19 =
  24. 24.199 + 28 =
  25. 25.68 + 57 =
  26. 26.81 + 97 =
  27. 27.235 + 67 =
  28. 28.39 + 47 =
  29. 29.341 + 77 =
  30. 30.35 + 38 =
  31. 31.189 + 49 =
  32. 32.179 + 29 =
  33. 33.142 + 59 =
  34. 34.482 + 99 =
  35. 35.92 + 18 =
  36. 36.77 + 59 =
  37. 37.253 + 89 =
  38. 38.454 + 99 =
  39. 39.426 + 47 =
  40. 40.88 + 29 =

Answer key

  1. 436
  2. 463
  3. 212
  4. 479
  5. 95
  6. 167
  7. 383
  8. 146
  9. 286
  10. 204
  11. 75
  12. 285
  13. 328
  14. 356
  15. 104
  16. 143
  17. 439
  18. 306
  19. 501
  20. 237
  21. 361
  22. 171
  23. 288
  24. 227
  25. 125
  26. 178
  27. 302
  28. 86
  29. 418
  30. 73
  31. 238
  32. 208
  33. 201
  34. 581
  35. 110
  36. 136
  37. 342
  38. 553
  39. 473
  40. 117

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