• Rounding involves the adjustment of a value to account for the proper number of significant digits.
  • To round a number, first decide how many significant figures the number should have.
  • Once you know that, round to that many digits, starting from the left.
  • If the number immediately to the right of the last significant digit is greater than or equal to 5, the lastsignificant digit is increased by 1.
  • The more rounding is done, the less reliable to figure is.
  • An approximate value may be sufficient for some purposes, but scientific work requires a much higher level of detail.
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