15/30 15 will go in to 30 2 times so that would make it reduced to the simplisted form of 1/2

You can always try dividing both the numerator and denominator by using the prime numbers 1,2,3,5 or 7 to break down the fraction. In the example above the prime number 3 will go into 15- 5 times and 30- 10 times to make the fraction 5/10 which breaks down to 1/2. Or you can use 5 to get 3/6 which also = 1/2.

Prime numbers are easy to find, all you have to do is ask yourself what number below the one I'm looking at, besides 1, can be divided into it? If there is one, then the number is not prime. For example 10 and 12 can be divided by 2 but there is no number below 11 that can be divided into 11, so 11 is a prime number.

I always hated the number 289. At one point or another someone would ask to reduce something like 68/289. Well, 4 won't go into 289, and three won't go into 68 so the answer is there is no reduction. Then someone would point out that 17 will go into 68- 4times and 17 will go into 289- 17 times so 68/289 reduces to 4/17. I Hate 289.

Prime numbers are easy to find, all you have to do is ask yourself what number below the one I'm looking at, besides 1, can be divided into it? If there is one, then the number is not prime. For example 10 and 12 can be divided by 2 but there is no number below 11 that can be divided into 11, so 11 is a prime number.

I always hated the number 289. At one point or another someone would ask to reduce something like 68/289. Well, 4 won't go into 289, and three won't go into 68 so the answer is there is no reduction. Then someone would point out that 17 will go into 68- 4times and 17 will go into 289- 17 times so 68/289 reduces to 4/17. I Hate 289.