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- A rational number is a number of the form
where p and q are integers and 
.
- Problems involving rational numbers are simplified using 'BODMAS' rule.
- A rational number can be represented in the decimal form.
- When a rational number is represented as a decimal, it will be either a terminating decimal or a recurring decimal.
- A terminating decimal or a recurring decimal can be represented in the form
.
- All real numbers which are not rational are called irrational numbers.
- If 'a' is not the nth power of any rational number,
is called a surd.
- All surds are irrational numbers.
- Rational numbers and irrational numbers together form the set of real numbers.
- All rational and irrational numbers can be marked on the number line.
- Numbers with surds in the denominator are supposed to be simplified by rationalising their denominators.
