Here we will show you how to determine if 5/9 is a terminating decimal or a nonterminating decimal.
A terminating decimal is a decimal number that has a finite number of decimals and does not go on indefinitely. We want to know if the decimal number you get when you divide the fraction 5/9 (5 ÷ 9) is terminating or nonterminating.
Here are the steps to determine if 5/9 is a terminating decimal number:
1) Find the denominator of 5/9 in its lowest form.
The greatest common factor (GCF) of 5 and 9 is 1. Convert 5/9 to its simplest form by dividing the numerator and denominator by its GCF:
 = 

Thus, the denominator of 5/9 in its lowest form is 9.
2) Find the prime factors of the answer in Step 1.
The prime factors of 9 are all the prime numbers that you multiply together to get 9. The prime factors of 9 are:
3 x 3
3) Determine if 5/9 is terminating
A fraction is a terminating decimal if the prime factors of the denominator of the fraction in its lowest form only contain 2s and/or 5s or no prime factors at all. This is not the case here, which means that our answer is as follows:
5/9
= nonterminating
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