Divide the top (numerator) and bottom (denominator) by their [highest] common factor[s].
hcf(6, 15) = 3
⇒ 6/15 = (6 ÷ 3)/(15 ÷ 3)
= 2/5
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6/15 = 3/5
No. 8/20 = 2.4/6 which is far from a simpler form.
It don't get no simpler, pardner.
6/45 = 2/15
4 and 6 are both whole numbers that cannot be reduced to simpler forms. If it were a fraction 4/6, that could be reduced to 2/3 because both 4 and 6 are divisible by 2. But whole numbers cannot be further simplified.