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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 266 · 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. 1.159 + 79 =
  2. 2.111 + 37 =
  3. 3.59 + 98 =
  4. 4.140 + 37 =
  5. 5.339 + 69 =
  6. 6.271 + 27 =
  7. 7.140 + 79 =
  8. 8.267 + 39 =
  9. 9.106 + 87 =
  10. 10.25 + 78 =
  11. 11.272 + 87 =
  12. 12.162 + 67 =
  13. 13.338 + 37 =
  14. 14.495 + 87 =
  15. 15.390 + 97 =
  16. 16.50 + 18 =
  17. 17.285 + 37 =
  18. 18.248 + 37 =
  19. 19.32 + 58 =
  20. 20.77 + 47 =
  21. 21.320 + 87 =
  22. 22.73 + 49 =
  23. 23.211 + 29 =
  24. 24.287 + 68 =
  25. 25.294 + 29 =
  26. 26.180 + 47 =
  27. 27.143 + 48 =
  28. 28.254 + 97 =
  29. 29.120 + 29 =
  30. 30.230 + 29 =
  31. 31.105 + 97 =
  32. 32.386 + 99 =
  33. 33.128 + 77 =
  34. 34.128 + 87 =
  35. 35.442 + 29 =
  36. 36.49 + 59 =
  37. 37.256 + 27 =
  38. 38.131 + 78 =
  39. 39.87 + 69 =
  40. 40.80 + 48 =

Answer key

  1. 238
  2. 148
  3. 157
  4. 177
  5. 408
  6. 298
  7. 219
  8. 306
  9. 193
  10. 103
  11. 359
  12. 229
  13. 375
  14. 582
  15. 487
  16. 68
  17. 322
  18. 285
  19. 90
  20. 124
  21. 407
  22. 122
  23. 240
  24. 355
  25. 323
  26. 227
  27. 191
  28. 351
  29. 149
  30. 259
  31. 202
  32. 485
  33. 205
  34. 215
  35. 471
  36. 108
  37. 283
  38. 209
  39. 156
  40. 128

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