Go to Inflex.

- Hit
`Formula`

. - Type
`22/7`

in the white box and hit`Enter`

. - You should see
`3`

. - Now click the number
`3`

to change the formula. - In the formula box, at the end add
`* 1.0000000000`

(multiple by 1 with decimal places). - You should now see
`3.1428571428`

. - Adjust the zeros to indicate how much precision you want.

You now know how to get the exact number of decimal places you want.