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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 895 · 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. 1.382 + 59 =
  2. 2.153 + 99 =
  3. 3.119 + 69 =
  4. 4.262 + 57 =
  5. 5.258 + 67 =
  6. 6.150 + 29 =
  7. 7.418 + 69 =
  8. 8.159 + 28 =
  9. 9.394 + 28 =
  10. 10.60 + 99 =
  11. 11.33 + 77 =
  12. 12.141 + 67 =
  13. 13.52 + 29 =
  14. 14.496 + 39 =
  15. 15.169 + 29 =
  16. 16.39 + 99 =
  17. 17.53 + 48 =
  18. 18.276 + 47 =
  19. 19.156 + 49 =
  20. 20.206 + 18 =
  21. 21.488 + 27 =
  22. 22.63 + 88 =
  23. 23.47 + 67 =
  24. 24.112 + 99 =
  25. 25.343 + 27 =
  26. 26.398 + 38 =
  27. 27.130 + 99 =
  28. 28.49 + 17 =
  29. 29.258 + 57 =
  30. 30.322 + 47 =
  31. 31.357 + 78 =
  32. 32.469 + 28 =
  33. 33.111 + 18 =
  34. 34.496 + 88 =
  35. 35.144 + 17 =
  36. 36.275 + 37 =
  37. 37.332 + 47 =
  38. 38.210 + 38 =
  39. 39.43 + 49 =
  40. 40.139 + 27 =

Answer key

  1. 441
  2. 252
  3. 188
  4. 319
  5. 325
  6. 179
  7. 487
  8. 187
  9. 422
  10. 159
  11. 110
  12. 208
  13. 81
  14. 535
  15. 198
  16. 138
  17. 101
  18. 323
  19. 205
  20. 224
  21. 515
  22. 151
  23. 114
  24. 211
  25. 370
  26. 436
  27. 229
  28. 66
  29. 315
  30. 369
  31. 435
  32. 497
  33. 129
  34. 584
  35. 161
  36. 312
  37. 379
  38. 248
  39. 92
  40. 166

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