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'One to Eight' printed from https://nrich.maths.org/
Here are some 'funny factorisations'. Complete the following
expressions so that each one gives a four digit number as the
product of two two digit numbers and uses the digits $2$ to $9$
once and only once.
** $\times$ ** $= 4876$
** $\times$ ** $= 5394$
Now do the same with the digits $1$ to $8$ to complete the
following expressions.
** $\times$ ** $= 1368$
$5$* $\times$ $6$* $=$ ****
$52$ $\times$ ** $=$ ****
Is there more than one solution?