First of all, to simplify a number/fraction, you must find a common multiple. Both 12 and 42 is divisible by 6 42 12 = 7 2 since 6 goes into 12, two times and goes into 42, 7 times. The answer is 7 2 when simplified.
12/42 simplified are 2/7 because you divide them both by six which leads u to that answer hope its helpful!!
The fraction 42 12 simplifies to 7 2 when both the numerator and denominator are divided by their greatest common divisor, which is 6.
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