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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 699 · 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. 1.140 + 39 =
  2. 2.237 + 39 =
  3. 3.402 + 88 =
  4. 4.45 + 47 =
  5. 5.73 + 77 =
  6. 6.62 + 27 =
  7. 7.405 + 77 =
  8. 8.154 + 59 =
  9. 9.32 + 19 =
  10. 10.362 + 98 =
  11. 11.49 + 79 =
  12. 12.406 + 58 =
  13. 13.306 + 28 =
  14. 14.91 + 17 =
  15. 15.139 + 18 =
  16. 16.127 + 79 =
  17. 17.66 + 98 =
  18. 18.266 + 67 =
  19. 19.216 + 87 =
  20. 20.86 + 37 =
  21. 21.241 + 27 =
  22. 22.158 + 99 =
  23. 23.234 + 67 =
  24. 24.328 + 87 =
  25. 25.103 + 77 =
  26. 26.189 + 18 =
  27. 27.282 + 28 =
  28. 28.300 + 97 =
  29. 29.34 + 97 =
  30. 30.114 + 19 =
  31. 31.442 + 58 =
  32. 32.231 + 58 =
  33. 33.416 + 67 =
  34. 34.196 + 58 =
  35. 35.57 + 37 =
  36. 36.362 + 58 =
  37. 37.395 + 97 =
  38. 38.144 + 69 =
  39. 39.437 + 58 =
  40. 40.164 + 89 =

Answer key

  1. 179
  2. 276
  3. 490
  4. 92
  5. 150
  6. 89
  7. 482
  8. 213
  9. 51
  10. 460
  11. 128
  12. 464
  13. 334
  14. 108
  15. 157
  16. 206
  17. 164
  18. 333
  19. 303
  20. 123
  21. 268
  22. 257
  23. 301
  24. 415
  25. 180
  26. 207
  27. 310
  28. 397
  29. 131
  30. 133
  31. 500
  32. 289
  33. 483
  34. 254
  35. 94
  36. 420
  37. 492
  38. 213
  39. 495
  40. 253

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