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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 899 · 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. 1.305 + 47 =
  2. 2.325 + 79 =
  3. 3.86 + 27 =
  4. 4.366 + 27 =
  5. 5.386 + 67 =
  6. 6.96 + 98 =
  7. 7.224 + 99 =
  8. 8.32 + 69 =
  9. 9.169 + 29 =
  10. 10.447 + 27 =
  11. 11.347 + 38 =
  12. 12.28 + 99 =
  13. 13.153 + 18 =
  14. 14.195 + 59 =
  15. 15.473 + 37 =
  16. 16.183 + 29 =
  17. 17.112 + 17 =
  18. 18.338 + 49 =
  19. 19.262 + 39 =
  20. 20.232 + 59 =
  21. 21.389 + 27 =
  22. 22.147 + 98 =
  23. 23.158 + 68 =
  24. 24.45 + 18 =
  25. 25.403 + 19 =
  26. 26.163 + 87 =
  27. 27.390 + 59 =
  28. 28.216 + 38 =
  29. 29.341 + 59 =
  30. 30.39 + 37 =
  31. 31.130 + 87 =
  32. 32.325 + 77 =
  33. 33.253 + 89 =
  34. 34.214 + 27 =
  35. 35.172 + 77 =
  36. 36.118 + 27 =
  37. 37.263 + 27 =
  38. 38.217 + 28 =
  39. 39.146 + 29 =
  40. 40.297 + 37 =

Answer key

  1. 352
  2. 404
  3. 113
  4. 393
  5. 453
  6. 194
  7. 323
  8. 101
  9. 198
  10. 474
  11. 385
  12. 127
  13. 171
  14. 254
  15. 510
  16. 212
  17. 129
  18. 387
  19. 301
  20. 291
  21. 416
  22. 245
  23. 226
  24. 63
  25. 422
  26. 250
  27. 449
  28. 254
  29. 400
  30. 76
  31. 217
  32. 402
  33. 342
  34. 241
  35. 249
  36. 145
  37. 290
  38. 245
  39. 175
  40. 334

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