Can you calculate 85 percent of 24 in your head? This is not as hard as it sounds. If you know how to halve numbers and divide by 10 you can probably do this in your head. This video explains how to calculate many percentages as a combination of ones that are easier to compute. If you like my videos, you can support me at Patreon: http://www.patreon.com/mindyourdecisions Connect on social media. I update each site when I have a new video or blog post, so you can follow me on whichever method