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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 469 · 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. 1.318 + 28 =
  2. 2.395 + 98 =
  3. 3.249 + 89 =
  4. 4.188 + 98 =
  5. 5.90 + 98 =
  6. 6.69 + 49 =
  7. 7.465 + 67 =
  8. 8.138 + 98 =
  9. 9.401 + 28 =
  10. 10.164 + 48 =
  11. 11.147 + 57 =
  12. 12.257 + 79 =
  13. 13.384 + 69 =
  14. 14.295 + 49 =
  15. 15.230 + 88 =
  16. 16.357 + 29 =
  17. 17.163 + 87 =
  18. 18.477 + 99 =
  19. 19.112 + 87 =
  20. 20.272 + 67 =
  21. 21.348 + 89 =
  22. 22.76 + 17 =
  23. 23.268 + 58 =
  24. 24.135 + 98 =
  25. 25.91 + 98 =
  26. 26.298 + 48 =
  27. 27.473 + 37 =
  28. 28.86 + 97 =
  29. 29.72 + 77 =
  30. 30.111 + 79 =
  31. 31.306 + 37 =
  32. 32.467 + 18 =
  33. 33.116 + 19 =
  34. 34.82 + 29 =
  35. 35.111 + 97 =
  36. 36.54 + 68 =
  37. 37.494 + 78 =
  38. 38.229 + 28 =
  39. 39.260 + 18 =
  40. 40.375 + 99 =

Answer key

  1. 346
  2. 493
  3. 338
  4. 286
  5. 188
  6. 118
  7. 532
  8. 236
  9. 429
  10. 212
  11. 204
  12. 336
  13. 453
  14. 344
  15. 318
  16. 386
  17. 250
  18. 576
  19. 199
  20. 339
  21. 437
  22. 93
  23. 326
  24. 233
  25. 189
  26. 346
  27. 510
  28. 183
  29. 149
  30. 190
  31. 343
  32. 485
  33. 135
  34. 111
  35. 208
  36. 122
  37. 572
  38. 257
  39. 278
  40. 474

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