Divide both the numerator and denominator by their HCF. The fraction has now been simplified. Knowing multiplication and division facts may make simplifying fractions easier. The HCF of 4 and 10 is 2.

You're running 30km? That's very impressive! Not as easy as you thought, huh? Don't worry, there's a water station after 3km. That's three 30ths of the way there. We can simplify that because both ...