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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 239 · 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. 1.453 + 57 =
  2. 2.65 + 27 =
  3. 3.307 + 17 =
  4. 4.232 + 17 =
  5. 5.176 + 57 =
  6. 6.27 + 59 =
  7. 7.179 + 29 =
  8. 8.315 + 67 =
  9. 9.30 + 67 =
  10. 10.131 + 97 =
  11. 11.414 + 87 =
  12. 12.378 + 38 =
  13. 13.334 + 57 =
  14. 14.351 + 77 =
  15. 15.64 + 57 =
  16. 16.138 + 68 =
  17. 17.38 + 39 =
  18. 18.235 + 29 =
  19. 19.348 + 77 =
  20. 20.349 + 57 =
  21. 21.273 + 28 =
  22. 22.325 + 88 =
  23. 23.136 + 78 =
  24. 24.69 + 38 =
  25. 25.456 + 98 =
  26. 26.343 + 98 =
  27. 27.228 + 88 =
  28. 28.179 + 79 =
  29. 29.227 + 69 =
  30. 30.201 + 28 =
  31. 31.469 + 29 =
  32. 32.90 + 17 =
  33. 33.422 + 77 =
  34. 34.69 + 97 =
  35. 35.161 + 87 =
  36. 36.139 + 99 =
  37. 37.486 + 99 =
  38. 38.107 + 87 =
  39. 39.386 + 59 =
  40. 40.275 + 38 =

Answer key

  1. 510
  2. 92
  3. 324
  4. 249
  5. 233
  6. 86
  7. 208
  8. 382
  9. 97
  10. 228
  11. 501
  12. 416
  13. 391
  14. 428
  15. 121
  16. 206
  17. 77
  18. 264
  19. 425
  20. 406
  21. 301
  22. 413
  23. 214
  24. 107
  25. 554
  26. 441
  27. 316
  28. 258
  29. 296
  30. 229
  31. 498
  32. 107
  33. 499
  34. 166
  35. 248
  36. 238
  37. 585
  38. 194
  39. 445
  40. 313

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