Think you have sharp math skills? This puzzle looks easy—but many people get it wrong at first glance!

You’re given:

432 + 1?8 = 600

One digit is missing. Can you figure out what belongs in the middle?

Take a moment before reading the answer. No calculator if you can help it!

A quick way to solve it is to work backward:

600 − 432 = 168

That means the missing number is 168, so the hidden digit is 6.

Answer: 6

Did you get it right on your first try? Challenge a friend and see who solves it faster!