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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 851 · 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. 1.144 + 67 =
  2. 2.345 + 47 =
  3. 3.191 + 27 =
  4. 4.405 + 77 =
  5. 5.481 + 39 =
  6. 6.291 + 47 =
  7. 7.93 + 97 =
  8. 8.318 + 68 =
  9. 9.439 + 98 =
  10. 10.162 + 97 =
  11. 11.308 + 19 =
  12. 12.94 + 19 =
  13. 13.281 + 98 =
  14. 14.102 + 17 =
  15. 15.455 + 97 =
  16. 16.69 + 67 =
  17. 17.338 + 98 =
  18. 18.235 + 77 =
  19. 19.448 + 98 =
  20. 20.439 + 79 =
  21. 21.410 + 99 =
  22. 22.250 + 37 =
  23. 23.208 + 18 =
  24. 24.115 + 19 =
  25. 25.117 + 39 =
  26. 26.271 + 88 =
  27. 27.278 + 88 =
  28. 28.117 + 87 =
  29. 29.121 + 98 =
  30. 30.305 + 18 =
  31. 31.272 + 99 =
  32. 32.238 + 97 =
  33. 33.71 + 98 =
  34. 34.468 + 37 =
  35. 35.106 + 59 =
  36. 36.265 + 79 =
  37. 37.342 + 69 =
  38. 38.411 + 28 =
  39. 39.64 + 58 =
  40. 40.196 + 27 =

Answer key

  1. 211
  2. 392
  3. 218
  4. 482
  5. 520
  6. 338
  7. 190
  8. 386
  9. 537
  10. 259
  11. 327
  12. 113
  13. 379
  14. 119
  15. 552
  16. 136
  17. 436
  18. 312
  19. 546
  20. 518
  21. 509
  22. 287
  23. 226
  24. 134
  25. 156
  26. 359
  27. 366
  28. 204
  29. 219
  30. 323
  31. 371
  32. 335
  33. 169
  34. 505
  35. 165
  36. 344
  37. 411
  38. 439
  39. 122
  40. 223

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