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PastPresentFuture
you can try taking apart the problem and doing this
4x7=28
4x90=360
4x100=400
add them up
and you get 788
srry if too complicated answer
I would multiply each from right to left, and when I got and answer for the first digit, ex: 7*4=28
I would keep in mind that there is a 2 I have to add, and just trace out 8 in my palm with my finger, or just mentally in my mind.
Continue to do it for the rest of them, and you will get your answer.
Hope this helps.

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