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Anonymous
15*3 = 3*5*3 = 3*3*5
18*5 = 2*3*3*5 = 2*3*3*5
So GCF = numbers that appear in both lists (however many times in both) = 3*3*5 = 45
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The product of 18 and 5 is 90
9x5 45x1 15x3
90 18x5=90 15x6=90
Use a calculator, it's 69....
area=basexheight=18x5=90