National 5 Mathematics

This deck contains things that are important to know, such as formulae not given in the exam and definitions of key terms.

What is an irrational number?

A number that is not an integer and cannot be expressed as a simple fraction, which means the decimals go on without a repeating pattern or terminate

What is a surd?

An irrational number that is expressed as a root

What is a rational number?

Any number that is an integer or can be expressed as a simple fraction

What is an integer?

A whole number

Why do we rationalise the denominators of fractions?

Because it’s okay for the numerator to be irrational but not the denominator

What does a sine graph look like?

What does a cosine graph look like?