What is #9 xx 7 = #?

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Answer 1 · 2018-06-29T12:21:21

Jun 29, 2018

63

Answer 2 · 2018-06-29T13:55:15

A bit of a cheat approach

To multiply by 10 is more straightforward but this will produce an error. This we can compensate for.

#9=(10-1)#

so #9xx7 color(white)("d") = (10-1)xx7#

#color(white)("d") (10xx7)-(1xx7)color(white)("ddd") =color(white)("ddd")70-7color(white)("ddd")=color(white)("ddd")63#