How to calculate percentages is easier than you think. Long time math fans may remember our first foray into the world of percentages way. Percentages (%). When we say "Percent" we are really saying "per ". One percent (1%) means 1 per 1 in 1% of this line is shaded green: it is very. Load more. Education · Math · Numeracy Tests; How to Do Basic Percentages with the Table of Joy Numeracy Tests For Dummies. By Colin Beveridge. Copy and paste it, adding a note of your own, into your blog, a Web page, forums, a blog comment, your Facebook account, or anywhere that someone would find this page valuable. Formula for percentage The formula for percentage is the following and it should be easy to use if you follow the straightforward directions given. The Three Types of Average — Median, Mode and Mean. Working out the sum, which is normally the easy bit. A large number and variety of printable math worksheets all with optional answer pages.