First, pick what you want to do: addition, subtraction, multiplication or division.

Then, pick your level...

Easy - uses one whole number and one decimal number.

Medium - uses two decimal numbers, but with one one or two decimal places.

Hard - uses two decimal numbers with up to four decimal places.

Killer - two decimal numbers with lots of decimal places.

The Decimals Cruncher will keep track of your score.  When you move to a new operation (addition, subtraction, multiplication or division), your score will start over again.