Category: Everyday Math

Percentage math looks simple, which is exactly why small errors slip through unnoticed. Here are 7 mistakes that show up constantly, from shopping to…

Counting days between two dates seems like basic math until a deadline slips by a day because of one of these easy-to-miss errors. 1.…

Global teams report cross-timezone meetings getting harder, not easier, and a single scheduling slip can mean half your team shows up an hour off.…

Only 3 countries have never officially adopted the metric system, but several more still use imperial units in daily life despite going metric on…

Two discounts don’t add together the way most people assume, and retailers rarely correct the misunderstanding. Here’s the actual math behind stacked discounts, and…

“How many years apart are we?” seems simple until the birthdays don’t line up neatly. Here’s the exact method for calculating an age gap…

“3 business days” and “3 calendar days” are very different deadlines, and mixing them up is a common, costly mistake for contracts, shipping, and…

A misplaced decimal or a mixed-up unit sounds like a minor slip. In these 5 documented cases, it destroyed a spacecraft, nearly crashed a…

You can’t multiply “8 hours 45 minutes” by an hourly rate directly, minutes aren’t base-100, they’re base-60. Here’s exactly how to convert time worked…

“How old are you” sounds like a simple question, but the answer has depended on where you’re standing for most of human history. Here…