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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 973 · 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. 1.412 + 79 =
  2. 2.497 + 19 =
  3. 3.71 + 17 =
  4. 4.141 + 59 =
  5. 5.123 + 47 =
  6. 6.460 + 19 =
  7. 7.151 + 39 =
  8. 8.391 + 19 =
  9. 9.245 + 79 =
  10. 10.281 + 37 =
  11. 11.409 + 39 =
  12. 12.469 + 19 =
  13. 13.282 + 77 =
  14. 14.323 + 37 =
  15. 15.198 + 97 =
  16. 16.74 + 17 =
  17. 17.97 + 79 =
  18. 18.319 + 27 =
  19. 19.347 + 37 =
  20. 20.82 + 68 =
  21. 21.187 + 57 =
  22. 22.461 + 69 =
  23. 23.405 + 39 =
  24. 24.478 + 88 =
  25. 25.335 + 28 =
  26. 26.34 + 17 =
  27. 27.25 + 29 =
  28. 28.79 + 27 =
  29. 29.148 + 88 =
  30. 30.201 + 29 =
  31. 31.348 + 89 =
  32. 32.54 + 87 =
  33. 33.198 + 69 =
  34. 34.472 + 19 =
  35. 35.409 + 29 =
  36. 36.393 + 67 =
  37. 37.139 + 78 =
  38. 38.129 + 77 =
  39. 39.259 + 99 =
  40. 40.97 + 38 =

Answer key

  1. 491
  2. 516
  3. 88
  4. 200
  5. 170
  6. 479
  7. 190
  8. 410
  9. 324
  10. 318
  11. 448
  12. 488
  13. 359
  14. 360
  15. 295
  16. 91
  17. 176
  18. 346
  19. 384
  20. 150
  21. 244
  22. 530
  23. 444
  24. 566
  25. 363
  26. 51
  27. 54
  28. 106
  29. 236
  30. 230
  31. 437
  32. 141
  33. 267
  34. 491
  35. 438
  36. 460
  37. 217
  38. 206
  39. 358
  40. 135

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