# Simple Arithmetic Puzzle 7. Or is it?

The Arithmetic Puzzles are finally back! The break I took was longer than expected...

Let's start easy then.

\begin{align}6\times8&=72\\10\times9&=6\\1\times1&=1\\18\times69&=\,?\end{align}

Can you find the value of the question mark?

• maybe the lateral thinking tag? – Omega Krypton May 18 at 14:19

$$5589$$

Because

You need to see the multiplication upside-down, (:
Hence, $$69 \times 81 = 5589$$

• Is it rotate the first operand and mirror the second? – James May 18 at 14:15
• @James You should ROT13(Ebgngr 180 Qrterrf gur Yrsg-Unaq-Fvqr) – athin May 18 at 15:16