how do i find the missing digit in the problem ( _7 x 40 = 680)

I have to find the missing digit in several problems. I just need help with one and I can do the rest. For example in the problem _7 x 40 =680, what digit is missing in front of the 7.
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2 Answers

x=680/40=17

............
by
just divide 680 by 40

680/40= 17

the 1 is missing in front of the 7
by Level 6 User (23.6k points)

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