mental math

This Is Why You Always Think Things Will Cost Less Than They Do

Estimating costs is hard — and the sad part is, much of the time it's because our brains are working against us. Here's how to regain control.

Doubling Your Money with the Rule of 72

Did you ever wonder how financial professionals can so quickly mentally calculate how much money you’ll have in 30 years based on an investment return? Seems like magic, huh? Well,