-2a^2 / 24ab is not -12ab
It is -a/12b
because you have -(2a)(a) / (2a)(12b)
and the 2a's cancel
6ab^2/24ab = (6ab)(b) / (6ab)(4) = b/4
12a^2b^3 / 24ab = (12ab)(ab^2) / (12ab)(2) = ab^2/2
Looks like you have some serious practice ahead. You can enter your expressions in wolframalpha.com to check your answers.
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