Break it up into two separate problems. First 4X25=100, which is easy enough. Then 27X100=2700.
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the property which states that for all real numbers a,b,and c their product is always the same, regardless of their grouping
No.
4*25 = 100 So 4*25*27 = (4*25)*27 = 100*27 = 2700
It depends on your computational skills.
Your brain, of course.