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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 433 · 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. 1.280 + 38 =
  2. 2.209 + 18 =
  3. 3.87 + 58 =
  4. 4.455 + 68 =
  5. 5.77 + 47 =
  6. 6.131 + 69 =
  7. 7.489 + 17 =
  8. 8.442 + 57 =
  9. 9.172 + 27 =
  10. 10.387 + 88 =
  11. 11.251 + 49 =
  12. 12.332 + 17 =
  13. 13.133 + 68 =
  14. 14.97 + 39 =
  15. 15.67 + 17 =
  16. 16.39 + 67 =
  17. 17.261 + 38 =
  18. 18.88 + 37 =
  19. 19.415 + 89 =
  20. 20.150 + 99 =
  21. 21.30 + 69 =
  22. 22.398 + 87 =
  23. 23.90 + 18 =
  24. 24.488 + 98 =
  25. 25.280 + 29 =
  26. 26.149 + 27 =
  27. 27.69 + 48 =
  28. 28.291 + 78 =
  29. 29.272 + 68 =
  30. 30.311 + 69 =
  31. 31.440 + 47 =
  32. 32.127 + 89 =
  33. 33.455 + 98 =
  34. 34.311 + 57 =
  35. 35.279 + 38 =
  36. 36.376 + 88 =
  37. 37.389 + 18 =
  38. 38.169 + 29 =
  39. 39.247 + 79 =
  40. 40.46 + 27 =

Answer key

  1. 318
  2. 227
  3. 145
  4. 523
  5. 124
  6. 200
  7. 506
  8. 499
  9. 199
  10. 475
  11. 300
  12. 349
  13. 201
  14. 136
  15. 84
  16. 106
  17. 299
  18. 125
  19. 504
  20. 249
  21. 99
  22. 485
  23. 108
  24. 586
  25. 309
  26. 176
  27. 117
  28. 369
  29. 340
  30. 380
  31. 487
  32. 216
  33. 553
  34. 368
  35. 317
  36. 464
  37. 407
  38. 198
  39. 326
  40. 73

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