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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 882 · 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. 1.123 + 97 =
  2. 2.249 + 28 =
  3. 3.271 + 49 =
  4. 4.89 + 57 =
  5. 5.160 + 18 =
  6. 6.102 + 97 =
  7. 7.148 + 39 =
  8. 8.124 + 17 =
  9. 9.286 + 38 =
  10. 10.344 + 79 =
  11. 11.190 + 79 =
  12. 12.55 + 58 =
  13. 13.492 + 78 =
  14. 14.34 + 28 =
  15. 15.448 + 28 =
  16. 16.318 + 37 =
  17. 17.230 + 47 =
  18. 18.59 + 29 =
  19. 19.397 + 47 =
  20. 20.210 + 99 =
  21. 21.200 + 59 =
  22. 22.242 + 28 =
  23. 23.69 + 47 =
  24. 24.457 + 98 =
  25. 25.297 + 99 =
  26. 26.90 + 27 =
  27. 27.405 + 17 =
  28. 28.75 + 89 =
  29. 29.257 + 59 =
  30. 30.145 + 87 =
  31. 31.156 + 18 =
  32. 32.210 + 29 =
  33. 33.349 + 77 =
  34. 34.499 + 68 =
  35. 35.145 + 27 =
  36. 36.420 + 19 =
  37. 37.30 + 67 =
  38. 38.31 + 68 =
  39. 39.368 + 58 =
  40. 40.469 + 29 =

Answer key

  1. 220
  2. 277
  3. 320
  4. 146
  5. 178
  6. 199
  7. 187
  8. 141
  9. 324
  10. 423
  11. 269
  12. 113
  13. 570
  14. 62
  15. 476
  16. 355
  17. 277
  18. 88
  19. 444
  20. 309
  21. 259
  22. 270
  23. 116
  24. 555
  25. 396
  26. 117
  27. 422
  28. 164
  29. 316
  30. 232
  31. 174
  32. 239
  33. 426
  34. 567
  35. 172
  36. 439
  37. 97
  38. 99
  39. 426
  40. 498

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