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6/90 => 3/45 => 1/15 i.e. what number goes into 90, 6 times? 15.
84/90 Since both numbers are EVEN, then cancel down (reduce) by '2' Hence 42/45 Cancel down by '3' The next prime number ,and a factor of both '42' % '45'. 14/15 The answer!!!!!
16/45 cannot be simplified.
45/63 is 5/7 simplified
11/90. It cannot be further simplified.