Number of Significant Figures in Result of Addition or Subtraction/Examples/47.816 - 25

Example of Use of Number of Significant Figures in Result of Addition or Subtraction

 * $47 \cdotp 816 - 25 = 22 \cdotp 816$

on the assumption that $25$ is exact.

Proof
We have that:
 * the least significant digit $d_m$ of $47 \cdotp 816$ is the $10^{-3}$ position
 * the least significant digit $d_n$ of $25$ is the $10^{-\infty}$ position.

So from Number of Significant Figures in Result of Addition or Subtraction:


 * the least significant digit of $47 \cdotp 816 - 25$ is the greater significant digit of $10^{-3}$ and $10^{-\infty}$, that is $10^{-3}$.