Hats off to you Paul.
You are absolutely right.
Q) How can you look at a fraction and tell if is a terminating or non terminating decimal?
a) First you need to ensure that you have the fraction in lowest terms.
b) Then look at the denominator. If the denominator has only 2's or 5's as prime factors then it is a terminating decimal. If not then it is a repeating decimal.
Now, lets explore the options:
Lets forget the numerators and pick up only the denominators:
189,225 and 144 have 3(prime no) as a factor. 196 has 7 as a prime factor.That just leaves us with 128 which has only 2 as a primefactor. Therefore,E is the answer.
510 on my first GMAT. 610 on second GMAT.!
The struggle continues.