Arthur D. answered 04/18/15
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Forty Year Educator: Classroom, Summer School, Substitute, Tutor
50*30=1500 is a quick estimate because you only have to multiply 5*3 and add the zeroes
50*28=1400 is a better estimate because 27 isn't rounded so high and it is easy to use mental math; 50*20=1000 and 50*8=400 and 1000+400=1400
the exact answer 51*27=1377