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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 932 · 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. 1.195 + 17 =
  2. 2.40 + 29 =
  3. 3.39 + 98 =
  4. 4.364 + 47 =
  5. 5.87 + 89 =
  6. 6.333 + 78 =
  7. 7.219 + 47 =
  8. 8.450 + 47 =
  9. 9.413 + 48 =
  10. 10.175 + 77 =
  11. 11.153 + 77 =
  12. 12.58 + 18 =
  13. 13.88 + 39 =
  14. 14.80 + 29 =
  15. 15.55 + 17 =
  16. 16.330 + 69 =
  17. 17.154 + 29 =
  18. 18.489 + 69 =
  19. 19.154 + 99 =
  20. 20.273 + 57 =
  21. 21.37 + 97 =
  22. 22.170 + 97 =
  23. 23.457 + 87 =
  24. 24.403 + 98 =
  25. 25.472 + 27 =
  26. 26.154 + 68 =
  27. 27.243 + 19 =
  28. 28.272 + 38 =
  29. 29.393 + 28 =
  30. 30.89 + 77 =
  31. 31.188 + 77 =
  32. 32.303 + 58 =
  33. 33.230 + 18 =
  34. 34.255 + 87 =
  35. 35.116 + 87 =
  36. 36.152 + 27 =
  37. 37.99 + 98 =
  38. 38.76 + 68 =
  39. 39.186 + 58 =
  40. 40.70 + 87 =

Answer key

  1. 212
  2. 69
  3. 137
  4. 411
  5. 176
  6. 411
  7. 266
  8. 497
  9. 461
  10. 252
  11. 230
  12. 76
  13. 127
  14. 109
  15. 72
  16. 399
  17. 183
  18. 558
  19. 253
  20. 330
  21. 134
  22. 267
  23. 544
  24. 501
  25. 499
  26. 222
  27. 262
  28. 310
  29. 421
  30. 166
  31. 265
  32. 361
  33. 248
  34. 342
  35. 203
  36. 179
  37. 197
  38. 144
  39. 244
  40. 157

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