Math Help please???!!!

Write 385/420 in simplest form
A. 11/12
B.33/36
C.11/36
D.33/12

Miss Mily,

Since the numbers end in 5 and 0 they both divide by 5

This gives 77 / 84

It is obvious that 77 divides by 7 and if you remember your
twelve times tables, 12 * 7 = 84. So divide each by 7....

11 / 12.........ANSWER........A

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at first glance, you should notice that both numerator and denominator are divisible by five, giving you

77/84

and now you should notice that both numerator and denominator are divisible by 7, giving you

11/12

(A)

385 = 5 * 7 * 11
420 = 2² * 3 * 5 * 7

385/420 = (5 * 7 * 11) / (2² * 3 * 5 * 7) = 11 / (2² * 3) = 11/12 → A is correct

A.11/12

A. 11/12

A.