Key learning points

1. Common denominators for non-related fractions can be found using common multiples of the denominators.
2. Fractions need to have the same denominator if we are to add and subtract them.
3. In equivalent fractions, the numerators and denominators have been scaled up or down by the same factor.

Common misconception

Keywords

• Common denominator - When two or more fractions share the same denominator, you can say they have a common denominator.

• Related fractions - Related fractions are when the denominator of one fraction is a multiple of the denominator of the other fraction.

• Non-related fractions - Non-related fractions are when the denominator of one fraction is not a multiple of the denominator of the other fraction.

• Common multiple - A multiple that is common between two or more numbers is known as a common multiple.