Determine whether the number is an infinite decimal number by dividing both the denominator and the numerator into prime factors.

a) [[$ \displaystyle\frac {1} {12} $]]

Answer: The number is is not an infinite decimal number.

b) [[$ \displaystyle\frac {3} {12} $]]

Answer: The number is is not an infinite decimal number.

c) [[$ \displaystyle\frac {7} {140} $]]

Answer: The number is is not an infinite decimal number.

d) [[$ \displaystyle\frac {25} {180} $]]

Answer: The number is is not an infinite decimal number.