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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 109 · 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. 1.235 + 39 =
  2. 2.377 + 37 =
  3. 3.202 + 87 =
  4. 4.73 + 29 =
  5. 5.171 + 68 =
  6. 6.43 + 78 =
  7. 7.145 + 27 =
  8. 8.341 + 78 =
  9. 9.133 + 19 =
  10. 10.64 + 68 =
  11. 11.217 + 37 =
  12. 12.282 + 68 =
  13. 13.84 + 97 =
  14. 14.282 + 37 =
  15. 15.29 + 77 =
  16. 16.424 + 57 =
  17. 17.171 + 18 =
  18. 18.477 + 27 =
  19. 19.163 + 47 =
  20. 20.55 + 67 =
  21. 21.495 + 79 =
  22. 22.220 + 97 =
  23. 23.370 + 57 =
  24. 24.46 + 19 =
  25. 25.228 + 77 =
  26. 26.47 + 88 =
  27. 27.43 + 57 =
  28. 28.459 + 87 =
  29. 29.466 + 49 =
  30. 30.70 + 68 =
  31. 31.45 + 67 =
  32. 32.248 + 58 =
  33. 33.258 + 17 =
  34. 34.118 + 27 =
  35. 35.282 + 68 =
  36. 36.74 + 69 =
  37. 37.34 + 58 =
  38. 38.179 + 38 =
  39. 39.89 + 89 =
  40. 40.371 + 67 =

Answer key

  1. 274
  2. 414
  3. 289
  4. 102
  5. 239
  6. 121
  7. 172
  8. 419
  9. 152
  10. 132
  11. 254
  12. 350
  13. 181
  14. 319
  15. 106
  16. 481
  17. 189
  18. 504
  19. 210
  20. 122
  21. 574
  22. 317
  23. 427
  24. 65
  25. 305
  26. 135
  27. 100
  28. 546
  29. 515
  30. 138
  31. 112
  32. 306
  33. 275
  34. 145
  35. 350
  36. 143
  37. 92
  38. 217
  39. 178
  40. 438

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