Rational numbers can be expressed as a fraction in the form [tex]\displaystyle\frac{p}{q}[/tex], where p is the numerator and q is the denominator.
Now, which numbers can and cannot be expressed as a fraction?
First of all, can we express [tex]\sqrt{12}[/tex] as a fraction? No, it's a surd.
Can we express [tex]\pi[/tex] as a fraction? No. Remember, pi is irrational. It has an infinite number of digits after the decimal point (same with √12)
Can we express [tex]-\displaystyle\frac{3}{7}[/tex] as a fraction? Sure. What's more, it's already a fraction.
Can we express √7 as a fraction? No. It's also irrational, like √12 and π.
