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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 837 · 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. 1.101 + 59 =
  2. 2.258 + 17 =
  3. 3.438 + 29 =
  4. 4.125 + 59 =
  5. 5.193 + 69 =
  6. 6.493 + 29 =
  7. 7.354 + 28 =
  8. 8.146 + 37 =
  9. 9.75 + 68 =
  10. 10.224 + 39 =
  11. 11.498 + 67 =
  12. 12.158 + 39 =
  13. 13.57 + 89 =
  14. 14.269 + 99 =
  15. 15.327 + 29 =
  16. 16.142 + 88 =
  17. 17.224 + 37 =
  18. 18.138 + 68 =
  19. 19.36 + 69 =
  20. 20.153 + 19 =
  21. 21.66 + 57 =
  22. 22.77 + 37 =
  23. 23.47 + 89 =
  24. 24.264 + 89 =
  25. 25.269 + 29 =
  26. 26.485 + 99 =
  27. 27.438 + 18 =
  28. 28.342 + 79 =
  29. 29.69 + 87 =
  30. 30.263 + 29 =
  31. 31.350 + 38 =
  32. 32.255 + 48 =
  33. 33.284 + 98 =
  34. 34.247 + 87 =
  35. 35.66 + 17 =
  36. 36.246 + 59 =
  37. 37.337 + 37 =
  38. 38.285 + 99 =
  39. 39.150 + 29 =
  40. 40.351 + 29 =

Answer key

  1. 160
  2. 275
  3. 467
  4. 184
  5. 262
  6. 522
  7. 382
  8. 183
  9. 143
  10. 263
  11. 565
  12. 197
  13. 146
  14. 368
  15. 356
  16. 230
  17. 261
  18. 206
  19. 105
  20. 172
  21. 123
  22. 114
  23. 136
  24. 353
  25. 298
  26. 584
  27. 456
  28. 421
  29. 156
  30. 292
  31. 388
  32. 303
  33. 382
  34. 334
  35. 83
  36. 305
  37. 374
  38. 384
  39. 179
  40. 380

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