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Dp Dp Presentation Transcript

  • Decimal places
  • Illustration
    Decimal places (d.p.) refer to the digits to right of the decimal point. For example ‘23.845’ have 3 decimal places.
    The numbers we get from a computation often contains worthless digits that must be thrown away.
    Whenever we do this we must round our answer to the required decimal places.
  • Rule 1
    If the first digit to be discarded is greater than 5, or a 5 followed by a non zero in any of the decimal placed to the right, then round up by the last digit retained.
  • Rule 2
    If the first digit to be discarded is less than 5, round down by the last digit retained.
    Write -6.0439 to 2 d.p. Here 3 is first discarded digit and 4 is the last retained digit. Since 3<5 so we round down and hence result will be -6.04.
  • Rule 3 (Important)
    If the first digit to be discarded is equal to 5, always round to the nearest even number.
  • Do not Forget to…
    When you were asked to write a number to for example to 3 d.p., consider the first 4 d.p. places during the computation and write the end result to 3 decimal places.
    Got It?
  • For example, here is a series of addition and result is required to 2.d.p
  • Any
    ?