Answer :

First of all, to simplify a number/fraction, you must find a common multiple.
Both 12 and 42 is divisible by 6
[tex] \frac{12}{42} [/tex]=[tex] \frac{2}{7} [/tex] since 6 goes into 12, two times and goes into 42, 7 times. The answer is [tex] \frac{2}{7} [/tex] when simplified. 
12/42 simplified are 2/7 because you divide them both by six which leads u to that  answer 
hope its helpful!!

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