12
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Let's see who can find the result of the last equation:

$$\begin{align}30\times43&=1111\\23\times60&=2345\\35\times42&=9876\\39\times40&=\text{????}\end{align}$$

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  • $\begingroup$ @TheSimpliFire should see this if he/she has not already :D $\endgroup$ – Feeds Jul 21 '18 at 9:18
23
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39*40 =

0000

because

1290, 1380, 1470 and 1560 are the real results of those operations

and that way,

each column are those results

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