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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 914 · 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. 1.224 + 38 =
  2. 2.135 + 88 =
  3. 3.260 + 28 =
  4. 4.28 + 27 =
  5. 5.26 + 97 =
  6. 6.215 + 79 =
  7. 7.323 + 69 =
  8. 8.47 + 99 =
  9. 9.117 + 69 =
  10. 10.288 + 98 =
  11. 11.353 + 78 =
  12. 12.285 + 68 =
  13. 13.330 + 38 =
  14. 14.123 + 18 =
  15. 15.300 + 98 =
  16. 16.120 + 69 =
  17. 17.488 + 67 =
  18. 18.343 + 97 =
  19. 19.277 + 57 =
  20. 20.428 + 67 =
  21. 21.330 + 89 =
  22. 22.367 + 98 =
  23. 23.31 + 18 =
  24. 24.115 + 17 =
  25. 25.376 + 49 =
  26. 26.34 + 69 =
  27. 27.129 + 87 =
  28. 28.115 + 99 =
  29. 29.458 + 47 =
  30. 30.497 + 69 =
  31. 31.395 + 48 =
  32. 32.457 + 67 =
  33. 33.453 + 37 =
  34. 34.272 + 58 =
  35. 35.392 + 28 =
  36. 36.157 + 47 =
  37. 37.44 + 67 =
  38. 38.107 + 38 =
  39. 39.152 + 89 =
  40. 40.382 + 77 =

Answer key

  1. 262
  2. 223
  3. 288
  4. 55
  5. 123
  6. 294
  7. 392
  8. 146
  9. 186
  10. 386
  11. 431
  12. 353
  13. 368
  14. 141
  15. 398
  16. 189
  17. 555
  18. 440
  19. 334
  20. 495
  21. 419
  22. 465
  23. 49
  24. 132
  25. 425
  26. 103
  27. 216
  28. 214
  29. 505
  30. 566
  31. 443
  32. 524
  33. 490
  34. 330
  35. 420
  36. 204
  37. 111
  38. 145
  39. 241
  40. 459

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