THURSDAY 4TH OF OCTOBER YEAR 6 SET 1 MATHS

L.O: ORDERING FRACTIONS

Ordering fractions which have different denominators can be difficult…… Would you rather have….. 4 1 3 5 4 10 of a pizza?

Its hard to decide which is the biggest, so this is what we do to make it easier…. 4 1 3 5 4 10 Each of these fractions has a different denominator. We need to change the denominator so that they all have the Same one.

This is how we change the denominator……. 4 1 3 5 4 10 We find a larger number that all three denominators with multiply into. For example, the numbers 5, 4 and 10 all can multiply to make 20- so we make the common denominator 20.

This is how we change the denominator……. 4 1 3 5 4 10 X 5 X 2 X 4 We multiply 10 by 2 to get a denominator of 20 We multiply 4 by 5 to get a denominator Of 20 We multiply 5 by 4 to get a denominator of 20

What ever we multiply the denominator by, we must do the same with the numerator 4 1 3 5 4 10 X 5 X 2 X 4 16 5 6 20 20 20 Now its easy to place these in order! 5 6 16 20 20 20

What ever we multiply the denominator by, we must do the same with the numerator 4 1 3 5 4 10 So this one is the biggest X 5 X 2 X 4 16 5 6 20 20 20 Now its easy to place these in order! 5 6 16 20 20 20

RECAP….. To order fractions we first must change the denominator Find a larger number that all the denominators will multiply into (e.g. 18) Decide what you need to multiply each fraction into to get the same denominator (e.g. by 4 or 5) Make sure you multiply the numerator by the same amount Now its easy to order the fractions