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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 887 · 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. 1.311 + 77 =
  2. 2.335 + 48 =
  3. 3.364 + 59 =
  4. 4.382 + 18 =
  5. 5.327 + 59 =
  6. 6.79 + 58 =
  7. 7.350 + 19 =
  8. 8.281 + 79 =
  9. 9.202 + 49 =
  10. 10.462 + 99 =
  11. 11.96 + 29 =
  12. 12.471 + 98 =
  13. 13.427 + 87 =
  14. 14.34 + 39 =
  15. 15.453 + 89 =
  16. 16.133 + 39 =
  17. 17.366 + 19 =
  18. 18.176 + 29 =
  19. 19.190 + 98 =
  20. 20.95 + 77 =
  21. 21.379 + 78 =
  22. 22.350 + 58 =
  23. 23.277 + 58 =
  24. 24.424 + 28 =
  25. 25.481 + 79 =
  26. 26.202 + 67 =
  27. 27.365 + 79 =
  28. 28.41 + 69 =
  29. 29.378 + 58 =
  30. 30.132 + 68 =
  31. 31.360 + 57 =
  32. 32.163 + 97 =
  33. 33.366 + 48 =
  34. 34.59 + 39 =
  35. 35.158 + 87 =
  36. 36.301 + 97 =
  37. 37.333 + 57 =
  38. 38.82 + 37 =
  39. 39.456 + 88 =
  40. 40.449 + 28 =

Answer key

  1. 388
  2. 383
  3. 423
  4. 400
  5. 386
  6. 137
  7. 369
  8. 360
  9. 251
  10. 561
  11. 125
  12. 569
  13. 514
  14. 73
  15. 542
  16. 172
  17. 385
  18. 205
  19. 288
  20. 172
  21. 457
  22. 408
  23. 335
  24. 452
  25. 560
  26. 269
  27. 444
  28. 110
  29. 436
  30. 200
  31. 417
  32. 260
  33. 414
  34. 98
  35. 245
  36. 398
  37. 390
  38. 119
  39. 544
  40. 477

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