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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 182 · 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. 1.97 + 89 =
  2. 2.405 + 58 =
  3. 3.252 + 77 =
  4. 4.110 + 97 =
  5. 5.488 + 49 =
  6. 6.131 + 38 =
  7. 7.94 + 97 =
  8. 8.120 + 28 =
  9. 9.157 + 57 =
  10. 10.138 + 49 =
  11. 11.275 + 88 =
  12. 12.454 + 38 =
  13. 13.42 + 58 =
  14. 14.246 + 37 =
  15. 15.411 + 68 =
  16. 16.195 + 18 =
  17. 17.72 + 79 =
  18. 18.259 + 27 =
  19. 19.378 + 97 =
  20. 20.305 + 97 =
  21. 21.209 + 97 =
  22. 22.293 + 17 =
  23. 23.425 + 59 =
  24. 24.49 + 59 =
  25. 25.71 + 77 =
  26. 26.362 + 98 =
  27. 27.208 + 59 =
  28. 28.47 + 99 =
  29. 29.411 + 77 =
  30. 30.170 + 78 =
  31. 31.101 + 77 =
  32. 32.83 + 69 =
  33. 33.349 + 57 =
  34. 34.348 + 17 =
  35. 35.70 + 79 =
  36. 36.224 + 98 =
  37. 37.91 + 38 =
  38. 38.467 + 99 =
  39. 39.306 + 69 =
  40. 40.441 + 98 =

Answer key

  1. 186
  2. 463
  3. 329
  4. 207
  5. 537
  6. 169
  7. 191
  8. 148
  9. 214
  10. 187
  11. 363
  12. 492
  13. 100
  14. 283
  15. 479
  16. 213
  17. 151
  18. 286
  19. 475
  20. 402
  21. 306
  22. 310
  23. 484
  24. 108
  25. 148
  26. 460
  27. 267
  28. 146
  29. 488
  30. 248
  31. 178
  32. 152
  33. 406
  34. 365
  35. 149
  36. 322
  37. 129
  38. 566
  39. 375
  40. 539

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