Why Does Adding Digits Reveal Divisibility by 3? (Math Explained!)

Have you ever wondered why adding the digits of a number tells you if it’s divisible by 3? This quick math breakdown reveals the elegant algebra behind this clever trick using a simple 3-digit number. Spoiler: it all comes down to how numbers are built from 9s and 1s! Whether you're a student, teacher, or just curious about math magic, this short will make you see numbers in a new way. 🎥 Don’t forget to like, comment with your favorite math trick, and subscribe for more visual math explainer shorts!