7
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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?

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    $\begingroup$ maybe the lateral thinking tag? $\endgroup$ May 18, 2019 at 14:19

1 Answer 1

9
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The answer is

$5589$

Because

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

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    $\begingroup$ Is it rotate the first operand and mirror the second? $\endgroup$
    – James
    May 18, 2019 at 14:15
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    $\begingroup$ @James You should ROT13(Ebgngr 180 Qrterrf gur Yrsg-Unaq-Fvqr) $\endgroup$
    – athin
    May 18, 2019 at 15:16

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