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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 118 · 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. 1.300 + 97 =
  2. 2.133 + 37 =
  3. 3.474 + 58 =
  4. 4.412 + 67 =
  5. 5.254 + 88 =
  6. 6.319 + 17 =
  7. 7.134 + 59 =
  8. 8.225 + 18 =
  9. 9.61 + 87 =
  10. 10.466 + 49 =
  11. 11.149 + 57 =
  12. 12.266 + 18 =
  13. 13.267 + 57 =
  14. 14.441 + 87 =
  15. 15.109 + 37 =
  16. 16.223 + 27 =
  17. 17.221 + 58 =
  18. 18.265 + 28 =
  19. 19.99 + 19 =
  20. 20.82 + 69 =
  21. 21.46 + 97 =
  22. 22.371 + 29 =
  23. 23.462 + 77 =
  24. 24.499 + 18 =
  25. 25.153 + 97 =
  26. 26.327 + 38 =
  27. 27.303 + 38 =
  28. 28.115 + 67 =
  29. 29.176 + 67 =
  30. 30.206 + 27 =
  31. 31.235 + 47 =
  32. 32.258 + 58 =
  33. 33.176 + 17 =
  34. 34.117 + 19 =
  35. 35.58 + 67 =
  36. 36.32 + 68 =
  37. 37.141 + 19 =
  38. 38.69 + 67 =
  39. 39.257 + 19 =
  40. 40.194 + 99 =

Answer key

  1. 397
  2. 170
  3. 532
  4. 479
  5. 342
  6. 336
  7. 193
  8. 243
  9. 148
  10. 515
  11. 206
  12. 284
  13. 324
  14. 528
  15. 146
  16. 250
  17. 279
  18. 293
  19. 118
  20. 151
  21. 143
  22. 400
  23. 539
  24. 517
  25. 250
  26. 365
  27. 341
  28. 182
  29. 243
  30. 233
  31. 282
  32. 316
  33. 193
  34. 136
  35. 125
  36. 100
  37. 160
  38. 136
  39. 276
  40. 293

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