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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 901 · 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. 1.434 + 58 =
  2. 2.286 + 79 =
  3. 3.480 + 67 =
  4. 4.161 + 28 =
  5. 5.115 + 47 =
  6. 6.114 + 17 =
  7. 7.381 + 38 =
  8. 8.227 + 97 =
  9. 9.123 + 79 =
  10. 10.222 + 57 =
  11. 11.196 + 78 =
  12. 12.172 + 79 =
  13. 13.301 + 27 =
  14. 14.362 + 98 =
  15. 15.63 + 67 =
  16. 16.54 + 77 =
  17. 17.396 + 87 =
  18. 18.37 + 48 =
  19. 19.117 + 17 =
  20. 20.267 + 29 =
  21. 21.188 + 29 =
  22. 22.283 + 29 =
  23. 23.148 + 38 =
  24. 24.77 + 47 =
  25. 25.402 + 68 =
  26. 26.309 + 27 =
  27. 27.142 + 68 =
  28. 28.415 + 37 =
  29. 29.462 + 87 =
  30. 30.499 + 29 =
  31. 31.120 + 99 =
  32. 32.90 + 19 =
  33. 33.245 + 27 =
  34. 34.194 + 98 =
  35. 35.200 + 17 =
  36. 36.475 + 59 =
  37. 37.367 + 87 =
  38. 38.339 + 99 =
  39. 39.212 + 58 =
  40. 40.231 + 27 =

Answer key

  1. 492
  2. 365
  3. 547
  4. 189
  5. 162
  6. 131
  7. 419
  8. 324
  9. 202
  10. 279
  11. 274
  12. 251
  13. 328
  14. 460
  15. 130
  16. 131
  17. 483
  18. 85
  19. 134
  20. 296
  21. 217
  22. 312
  23. 186
  24. 124
  25. 470
  26. 336
  27. 210
  28. 452
  29. 549
  30. 528
  31. 219
  32. 109
  33. 272
  34. 292
  35. 217
  36. 534
  37. 454
  38. 438
  39. 270
  40. 258

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