Back to Mental Maths
LCM & HCF of Fractions
Two formulas that turn fractions into whole-number work
The Rule
- 1LCM of fractions = LCM of numerators ÷ HCF of denominators.
- 2HCF of fractions = HCF of numerators ÷ LCM of denominators.
- 3Write the fractions in lowest terms first.