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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 744 · 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. 1.436 + 79 =
  2. 2.226 + 78 =
  3. 3.117 + 37 =
  4. 4.41 + 87 =
  5. 5.177 + 18 =
  6. 6.96 + 98 =
  7. 7.97 + 27 =
  8. 8.470 + 38 =
  9. 9.131 + 37 =
  10. 10.417 + 27 =
  11. 11.294 + 37 =
  12. 12.77 + 28 =
  13. 13.170 + 67 =
  14. 14.72 + 78 =
  15. 15.431 + 37 =
  16. 16.145 + 39 =
  17. 17.141 + 29 =
  18. 18.172 + 17 =
  19. 19.129 + 89 =
  20. 20.210 + 89 =
  21. 21.137 + 37 =
  22. 22.164 + 47 =
  23. 23.148 + 58 =
  24. 24.205 + 28 =
  25. 25.134 + 37 =
  26. 26.145 + 57 =
  27. 27.318 + 97 =
  28. 28.99 + 99 =
  29. 29.327 + 97 =
  30. 30.289 + 98 =
  31. 31.225 + 99 =
  32. 32.206 + 79 =
  33. 33.373 + 47 =
  34. 34.400 + 79 =
  35. 35.258 + 87 =
  36. 36.118 + 17 =
  37. 37.80 + 88 =
  38. 38.267 + 99 =
  39. 39.212 + 57 =
  40. 40.102 + 39 =

Answer key

  1. 515
  2. 304
  3. 154
  4. 128
  5. 195
  6. 194
  7. 124
  8. 508
  9. 168
  10. 444
  11. 331
  12. 105
  13. 237
  14. 150
  15. 468
  16. 184
  17. 170
  18. 189
  19. 218
  20. 299
  21. 174
  22. 211
  23. 206
  24. 233
  25. 171
  26. 202
  27. 415
  28. 198
  29. 424
  30. 387
  31. 324
  32. 285
  33. 420
  34. 479
  35. 345
  36. 135
  37. 168
  38. 366
  39. 269
  40. 141

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