take 1/2 anad x/17. you would times the #s that are diagnol then divide by the # left.
1 x
_ _
2 17 1x17=17
17/2=8.5
so x=8.5
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Cross multiplication is when you multiply the denominator of a fraction by the numerator of another fraction. Before you cross multiply you want to see if you can simply the fractions.
yes
easy, just cross multiply
cross multiply and the fraction with the largest total is a greater fraction