The product of 18 and 5 is 90
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90 18x5=90 15x6=90
area=basexheight=18x5=90
18 nickels and 1 dime 18x5=90 and 90+10=100=$1.00
18 cannot be a multiple of 90 since it is smaller than it. 90 however is a multiple of 18. 18x5 = 90. an easy way to check is to divide the bigger number by the smaller number.
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