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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 459 · 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. 1.231 + 67 =
  2. 2.251 + 57 =
  3. 3.350 + 89 =
  4. 4.276 + 57 =
  5. 5.287 + 99 =
  6. 6.460 + 49 =
  7. 7.467 + 68 =
  8. 8.56 + 57 =
  9. 9.195 + 57 =
  10. 10.326 + 57 =
  11. 11.403 + 57 =
  12. 12.138 + 19 =
  13. 13.479 + 79 =
  14. 14.440 + 77 =
  15. 15.45 + 87 =
  16. 16.154 + 79 =
  17. 17.409 + 37 =
  18. 18.141 + 68 =
  19. 19.80 + 29 =
  20. 20.50 + 58 =
  21. 21.71 + 69 =
  22. 22.181 + 39 =
  23. 23.418 + 47 =
  24. 24.244 + 98 =
  25. 25.499 + 69 =
  26. 26.224 + 19 =
  27. 27.306 + 29 =
  28. 28.256 + 69 =
  29. 29.437 + 19 =
  30. 30.167 + 19 =
  31. 31.383 + 59 =
  32. 32.74 + 18 =
  33. 33.469 + 19 =
  34. 34.180 + 89 =
  35. 35.151 + 47 =
  36. 36.245 + 39 =
  37. 37.105 + 57 =
  38. 38.340 + 77 =
  39. 39.73 + 38 =
  40. 40.357 + 18 =

Answer key

  1. 298
  2. 308
  3. 439
  4. 333
  5. 386
  6. 509
  7. 535
  8. 113
  9. 252
  10. 383
  11. 460
  12. 157
  13. 558
  14. 517
  15. 132
  16. 233
  17. 446
  18. 209
  19. 109
  20. 108
  21. 140
  22. 220
  23. 465
  24. 342
  25. 568
  26. 243
  27. 335
  28. 325
  29. 456
  30. 186
  31. 442
  32. 92
  33. 488
  34. 269
  35. 198
  36. 284
  37. 162
  38. 417
  39. 111
  40. 375

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