Adding fractions
If the fractions being added have the same denominator, add the numerator and keep the denominators the same. If the fractions have different denominators, convert the fractions so that they have the same denominator. First, find the LCM (lowest common multiple) of both denominators. Convert the fractions so that both the denominators are both the lowest common multiple. Remember that the numerator and denominator are in direct proportion: when multiplying or dividing one of them by a number, you must do the same with the other. This means that the numerators will also be changed. Then add the numerators, but keep the denominators the same.
Subtracting fractions
If both fractions have the same denominator, subtract the numerators and keep the denominator the same. If they have different denominators, convert the fractions so that they have the same denominator, using the same method as addition: find the LCM. Then convert the fractions, subtract the numerators and keep the denominator the same.
Dividing
To divide fractions, we use a method called KCF. It stands for...
Kentucky
Chicken
Fillets.
Just kidding! I know they're delicious, but it actually stands for...
Keep the first fractions
Change the divide sign to multiply
Flip the second fraction.
Multiplying
Just multiply the numerator by numerator, and multiply the denominator by denominator. However, if it a mixed number, then the order of operations should be used.
Brackets
Indices (power, square roots etc.)
Division
Multiplication
Addition
Subtraction.
Then change the mixed fraction to an improper.
YOU ARE READING
Maths Revision
RandomMy funny and well-explained KS3 Maths Revision guide, derived from Bitesize. Still in progress, as I learn the nightmare called Maths by myself.
