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 ...

Here’s what you’ll learn when you read this story: Numberphile revived an ancient multiplication trick—halves and doubles—also called Egyptian or Russian math, where you repeatedly halve one number ...

The Mega Millions jackpot for Friday, Dec. 13, is an estimated $70 million. No one won the jackpot in the previous drawing on Tuesday, Dec. 9. Drawings are held twice a week on Tuesdays and Fridays at ...

Google Sheets is a versatile spreadsheet app you can use across multiple platforms, including any browser as a web app, on ...

Editor's note: Last updated following the Dec. 10, 2025 drawing. Let's face it. You face some pretty steep odds to win the Powerball jackpot, like a 1 in 292.2 million chance. So is there any way to ...

Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. Mira Norian / Investopedia A bank identification number (BIN) is the initial set of four to ...

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 ...