Formulas and rules
Every key math formula and rule, organised by topic and school level, with examples and study tips.
Fractions 3
M1
What is a fraction
numerator / denominator
A fraction is equal parts of a whole. The denominator is the number of parts, the numerator the number taken.
M1
Equivalent fractions
a/b = (a x k)/(b x k)
Multiplying or dividing top and bottom by the same number keeps the value.
M1
Comparing fractions
With the same denominator, the larger numerator is bigger. With the same numerator, the smaller denominator is bigger.