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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 879 · 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. 1.305 + 18 =
  2. 2.398 + 59 =
  3. 3.323 + 59 =
  4. 4.392 + 38 =
  5. 5.375 + 29 =
  6. 6.254 + 79 =
  7. 7.185 + 38 =
  8. 8.72 + 39 =
  9. 9.51 + 67 =
  10. 10.35 + 27 =
  11. 11.428 + 17 =
  12. 12.384 + 69 =
  13. 13.325 + 38 =
  14. 14.394 + 48 =
  15. 15.263 + 77 =
  16. 16.95 + 78 =
  17. 17.281 + 27 =
  18. 18.328 + 77 =
  19. 19.47 + 59 =
  20. 20.323 + 47 =
  21. 21.461 + 79 =
  22. 22.320 + 37 =
  23. 23.301 + 47 =
  24. 24.364 + 88 =
  25. 25.90 + 38 =
  26. 26.402 + 49 =
  27. 27.175 + 68 =
  28. 28.118 + 88 =
  29. 29.461 + 57 =
  30. 30.217 + 17 =
  31. 31.278 + 77 =
  32. 32.200 + 19 =
  33. 33.53 + 18 =
  34. 34.121 + 29 =
  35. 35.208 + 18 =
  36. 36.240 + 97 =
  37. 37.251 + 87 =
  38. 38.473 + 67 =
  39. 39.136 + 79 =
  40. 40.391 + 27 =

Answer key

  1. 323
  2. 457
  3. 382
  4. 430
  5. 404
  6. 333
  7. 223
  8. 111
  9. 118
  10. 62
  11. 445
  12. 453
  13. 363
  14. 442
  15. 340
  16. 173
  17. 308
  18. 405
  19. 106
  20. 370
  21. 540
  22. 357
  23. 348
  24. 452
  25. 128
  26. 451
  27. 243
  28. 206
  29. 518
  30. 234
  31. 355
  32. 219
  33. 71
  34. 150
  35. 226
  36. 337
  37. 338
  38. 540
  39. 215
  40. 418

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