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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 948 · 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. 1.426 + 29 =
  2. 2.243 + 18 =
  3. 3.484 + 27 =
  4. 4.314 + 59 =
  5. 5.463 + 37 =
  6. 6.318 + 29 =
  7. 7.240 + 19 =
  8. 8.72 + 87 =
  9. 9.433 + 79 =
  10. 10.93 + 48 =
  11. 11.26 + 77 =
  12. 12.340 + 19 =
  13. 13.433 + 88 =
  14. 14.312 + 28 =
  15. 15.348 + 97 =
  16. 16.463 + 38 =
  17. 17.402 + 87 =
  18. 18.220 + 18 =
  19. 19.102 + 47 =
  20. 20.181 + 87 =
  21. 21.82 + 68 =
  22. 22.78 + 48 =
  23. 23.364 + 57 =
  24. 24.188 + 37 =
  25. 25.171 + 67 =
  26. 26.163 + 28 =
  27. 27.267 + 19 =
  28. 28.400 + 57 =
  29. 29.136 + 97 =
  30. 30.215 + 79 =
  31. 31.243 + 49 =
  32. 32.480 + 97 =
  33. 33.469 + 99 =
  34. 34.363 + 27 =
  35. 35.87 + 47 =
  36. 36.156 + 29 =
  37. 37.327 + 29 =
  38. 38.170 + 27 =
  39. 39.115 + 67 =
  40. 40.439 + 89 =

Answer key

  1. 455
  2. 261
  3. 511
  4. 373
  5. 500
  6. 347
  7. 259
  8. 159
  9. 512
  10. 141
  11. 103
  12. 359
  13. 521
  14. 340
  15. 445
  16. 501
  17. 489
  18. 238
  19. 149
  20. 268
  21. 150
  22. 126
  23. 421
  24. 225
  25. 238
  26. 191
  27. 286
  28. 457
  29. 233
  30. 294
  31. 292
  32. 577
  33. 568
  34. 390
  35. 134
  36. 185
  37. 356
  38. 197
  39. 182
  40. 528

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