The international space station takes 644 minutes to orbit Earth seven times about how long does each orbit take

92 minutes for one orbit

Each orbit takes:

$644 \div 7\\ = (630)\div 7 + 14 \div 7\\ =90 + 2\\ = 92\text{ minutes}$

The first step is a clever method to do division that I found by myself in Primary School.(or Elementary School you call it.)