I wanted to figure out how many grams were to a lb and instead of looking it up I used my textbook and found 1 kg = 1000 g and 1 kg = 2.205 lb. I set up a cross multiplication equation to solve for x. The number I got was close but off by a few hundredths. I got 453.5147 g = 1 lb. I looked to see if I was right and found that the actual number is 453.59 g to lb. What did I do wrong?

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    $\begingroup$ I respect the effort in asking and answering your own question, but unit conversions are not within the purview of this site. $\endgroup$ – A.K. Oct 3 '18 at 2:51
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    $\begingroup$ I'm voting to close this question as off-topic because it is not about chemistry. $\endgroup$ – airhuff Oct 3 '18 at 3:10
  • $\begingroup$ chemistry.bd.psu.edu/jircitano/sigfigs.html. $\endgroup$ – Oscar Lanzi Oct 3 '18 at 9:39
  • $\begingroup$ Google says that 1 kg is 2.20462 pounds. Which is 0.2% off of what you wrote. That means that your converted answer will also be off by ~0.2%. $\endgroup$ – Zhe Oct 3 '18 at 12:00

1kg = 2.20462lb. Textbook just rounded.

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