In the decimal value 12.6 what power of 10 is associated with:

- The digit 1? 10
^{1} - The digit 2? 10
^{0} - The digit 6? 10
^{-1}

This
is just **base 10 positional notation** which you know
about already.
The **decimal point** is put between the 10^{0}
position and the 10^{-1} position.
Here is a longer example:

3 | 5 | 7 | . | 2 | 8 | 4 |

3×10^{2} | 5×10^{1} | 7×10^{ 0} | . |
2×10^{-1} | 8×10^{-2} | 4×10^{-3} |

The notation `357.284`

means 3 times 100, plus 5 times 10, plus 7 times 1,
plus 2 times 0.1, plus 8 times 0.01, plus 4 times 0.001.