book Maths Puzzle Numerical Ability

order the following fractions from least to greatest:2/25,7/24,3/17,1/11.
I know I need to find the LCD, but these are large numbers!
Thank you for the help!

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book Other Question
find the slope of the graph of f(x)=x^2-2x at the point (a,f(a)). Divide and simplify

3x^2 +13x + 4 / 3x^2-5x-12
____________ ________________
16-x^2 3x-12