008 About How Much? Round Any Number in Your Head — Explained Simply for Kids | Numberjoy

You've got $47 and someone asks 'about how much?' — is that closer to 40 or 50? Rounding turns a messy number into a quick, close one. On a number line you just pick the nearer ten, and the shortcut is simple: 5 or more rounds up, 4 or less rounds down. The same idea works for the nearest hundred, with one common trap to dodge.