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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 19 · 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. 1.70 + 59 =
  2. 2.95 + 49 =
  3. 3.302 + 19 =
  4. 4.259 + 87 =
  5. 5.130 + 29 =
  6. 6.117 + 57 =
  7. 7.254 + 28 =
  8. 8.30 + 89 =
  9. 9.458 + 39 =
  10. 10.25 + 88 =
  11. 11.405 + 59 =
  12. 12.176 + 59 =
  13. 13.75 + 59 =
  14. 14.371 + 48 =
  15. 15.202 + 67 =
  16. 16.465 + 38 =
  17. 17.157 + 57 =
  18. 18.315 + 37 =
  19. 19.374 + 58 =
  20. 20.419 + 18 =
  21. 21.217 + 19 =
  22. 22.464 + 88 =
  23. 23.276 + 68 =
  24. 24.410 + 39 =
  25. 25.275 + 77 =
  26. 26.356 + 69 =
  27. 27.138 + 97 =
  28. 28.46 + 19 =
  29. 29.402 + 19 =
  30. 30.321 + 97 =
  31. 31.37 + 59 =
  32. 32.384 + 68 =
  33. 33.43 + 28 =
  34. 34.194 + 59 =
  35. 35.44 + 78 =
  36. 36.99 + 37 =
  37. 37.128 + 99 =
  38. 38.48 + 77 =
  39. 39.375 + 59 =
  40. 40.465 + 59 =

Answer key

  1. 129
  2. 144
  3. 321
  4. 346
  5. 159
  6. 174
  7. 282
  8. 119
  9. 497
  10. 113
  11. 464
  12. 235
  13. 134
  14. 419
  15. 269
  16. 503
  17. 214
  18. 352
  19. 432
  20. 437
  21. 236
  22. 552
  23. 344
  24. 449
  25. 352
  26. 425
  27. 235
  28. 65
  29. 421
  30. 418
  31. 96
  32. 452
  33. 71
  34. 253
  35. 122
  36. 136
  37. 227
  38. 125
  39. 434
  40. 524

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