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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 602 · 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. 1.282 + 89 =
  2. 2.289 + 78 =
  3. 3.46 + 67 =
  4. 4.160 + 67 =
  5. 5.137 + 19 =
  6. 6.59 + 27 =
  7. 7.135 + 17 =
  8. 8.58 + 69 =
  9. 9.298 + 37 =
  10. 10.396 + 97 =
  11. 11.159 + 47 =
  12. 12.56 + 99 =
  13. 13.459 + 29 =
  14. 14.129 + 47 =
  15. 15.107 + 87 =
  16. 16.192 + 88 =
  17. 17.450 + 88 =
  18. 18.407 + 48 =
  19. 19.214 + 99 =
  20. 20.218 + 38 =
  21. 21.256 + 88 =
  22. 22.188 + 87 =
  23. 23.176 + 28 =
  24. 24.64 + 57 =
  25. 25.27 + 78 =
  26. 26.155 + 29 =
  27. 27.265 + 79 =
  28. 28.338 + 78 =
  29. 29.210 + 58 =
  30. 30.307 + 37 =
  31. 31.268 + 99 =
  32. 32.366 + 37 =
  33. 33.426 + 97 =
  34. 34.68 + 58 =
  35. 35.160 + 77 =
  36. 36.218 + 18 =
  37. 37.218 + 47 =
  38. 38.171 + 48 =
  39. 39.226 + 18 =
  40. 40.195 + 39 =

Answer key

  1. 371
  2. 367
  3. 113
  4. 227
  5. 156
  6. 86
  7. 152
  8. 127
  9. 335
  10. 493
  11. 206
  12. 155
  13. 488
  14. 176
  15. 194
  16. 280
  17. 538
  18. 455
  19. 313
  20. 256
  21. 344
  22. 275
  23. 204
  24. 121
  25. 105
  26. 184
  27. 344
  28. 416
  29. 268
  30. 344
  31. 367
  32. 403
  33. 523
  34. 126
  35. 237
  36. 236
  37. 265
  38. 219
  39. 244
  40. 234

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