To solve this type of problem, the best thing to do is factor both numbers first.
45=5*3*3
60=5*3*2*2
Shared factors don't need to be repeated, so we get:
GCM=5*3*3*2*2=180
An alternative method is to multiply the two numbers together:
45*60=2700
Then divide by all shared factors
GCM=2700/5/3=180
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60% of $45= 60% * 45= 0.6 * 45= $27
60% of 45= 60% * 45= 0.6 * 45= 27
45% of 60 = 45/100 X 60 = 27.
45% of $60 = 45/100 x $60 = $27
45 as a percentage of 60 is 45/60 times 100 = 75%