Numberphile revived an ancient multiplication trick—halves and doubles—also called Egyptian or Russian math, where you repeatedly halve one number and double the other. After crossing out rows with ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

A tangled mess of Christmas lights can be a major headache. Here's a simple way to store them now that you'll appreciate ...

Most people break out in a cold sweat when they see fractions. There's something about those little lines and numbers stacked on top of each other that makes even confident adults feel like they're ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Chip Stapleton is a Series 7 and Series 66 license holder, CFA Level 1 exam holder, and ...

Modern life is built to feel effortless, and that effortless feeling often comes with a price tag you barely notice.

When multiplying fractions, multiply the top numbers (numerators) together and multiply the bottom numbers (denominators) together, then simplify or it is sometimes easier simplify first.

Inbox management, like so much else, is a necessary evil in our day-to-day lives. As such, it’s best handled with the use of a strict system, but those can be tricky to implement and stick to. Also ...

I’m fascinated by Maundy Gregory, who sold honours for Lloyd George. He wouldn’t be tolerated today, but don’t assume our system is flawless, says author and biographer Stephen Bates ...

Here’s the simple playbook: tighten your packaging system with right-sizing, lighter materials, fewer but smarter box sizes, ...

Being involved in a car accident can be a physically and mentally draining experience. Seeking justice and compensation is ...

19 is only 1 away from 20, so you prefer to start by multiplying 20 times 5, which equals 100. Then we need to take away a squadron of 5, because there are actually only 19 squadrons, not 20. 100 take ...