Question

What Exactly is a rational number and how do they work in Math?

Answer 1

for this case we need to identify which number is a rational number and we need to remember that a rational number is any number that can be obtained from two integers :

`√(81)=9=(81)/(9)=9\text{ (rational number)}`
`√(50)=√(4\cdot5)=2√(5)\text{ (not rational number)}`

this number is not rational because icannot be obtained from the division of two integers

`-12=(-24)/(2)=-12\text{ (rational number)}`
`0=(0)/(10)=\text{ 0 (rational number)}`
`6.54545454\text{ (not a rational number)}`

The reason is because we can't obtain the number with two integers