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Use multiplying by 1 to find an expression equivalent to nine fifths with a denominator of 10b.

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1 = 2/2
Therefor if we multiply 9/5 by 2/2 we will get 18/10
Basically figure out what denominator you need and then find a suitable value of 1, where in this case 5*2 = 10 :)
User Walterfaye
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