Abridged Multiplication/Examples/Arbitrary Example

Example of Abridged Multiplication
Let:

Let it be required that $z = x y$ is to be rounded to $2$ decimal places.

Then, when we calculate:
 * $z = 5.6982 \times 23$

we can ignore the $4$th decimal place in the partial products of $x y$.

Demonstration
Performing the full multiplication:

5.6982 x     23 --  17.0946  113.9640 --  131.0586 --

which rounds to $131.06$.

Ignoring the $4$th decimal place:

5.6982 x     23 --  17.0946  113.9640 --   17.094        -- dropping the 4th decimal place 113.964 -- 131.058 -

which again rounds to $131.06$.