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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 943 · 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. 1.221 + 28 =
  2. 2.486 + 28 =
  3. 3.255 + 48 =
  4. 4.299 + 97 =
  5. 5.460 + 99 =
  6. 6.62 + 19 =
  7. 7.227 + 39 =
  8. 8.331 + 19 =
  9. 9.107 + 27 =
  10. 10.465 + 88 =
  11. 11.382 + 27 =
  12. 12.469 + 68 =
  13. 13.220 + 37 =
  14. 14.74 + 29 =
  15. 15.433 + 37 =
  16. 16.446 + 29 =
  17. 17.420 + 87 =
  18. 18.360 + 67 =
  19. 19.85 + 28 =
  20. 20.119 + 87 =
  21. 21.43 + 37 =
  22. 22.321 + 78 =
  23. 23.34 + 77 =
  24. 24.482 + 18 =
  25. 25.79 + 88 =
  26. 26.29 + 49 =
  27. 27.431 + 59 =
  28. 28.45 + 68 =
  29. 29.133 + 88 =
  30. 30.30 + 27 =
  31. 31.33 + 98 =
  32. 32.452 + 58 =
  33. 33.252 + 69 =
  34. 34.168 + 48 =
  35. 35.420 + 97 =
  36. 36.166 + 27 =
  37. 37.77 + 97 =
  38. 38.242 + 19 =
  39. 39.203 + 47 =
  40. 40.353 + 39 =

Answer key

  1. 249
  2. 514
  3. 303
  4. 396
  5. 559
  6. 81
  7. 266
  8. 350
  9. 134
  10. 553
  11. 409
  12. 537
  13. 257
  14. 103
  15. 470
  16. 475
  17. 507
  18. 427
  19. 113
  20. 206
  21. 80
  22. 399
  23. 111
  24. 500
  25. 167
  26. 78
  27. 490
  28. 113
  29. 221
  30. 57
  31. 131
  32. 510
  33. 321
  34. 216
  35. 517
  36. 193
  37. 174
  38. 261
  39. 250
  40. 392

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