To simplify a fraction-!, Find a number that goes into both the top and bottom numbers and divide them by this to simplify a fraction, To find a fraction of something-!, Divide by the bottom number then times by the top to find a fraction of something, To add fractions-!, Find the first number in both bottom numbers times tables then times both bits of the fraction by that number to add fractions, To put fractions in order-!, Turn the fractions to decimals then put those in order and write as the original fractions to put fractions in size order!, To turn a fraction into a decimal-!, Divide the top number by the bottom number to turn a fraction into a decimal, To show one number as a fraction of another-!, Write the first number as a fraction on top of the second, then simplify, to show one number as a fraction of another, To find a % of an amount-!, Divide the % by 100 then times it by the original amount to find the % of that amount!, To find the % a number has changed by-!, Divide the change by the original number, then x by 100 to find the % a number has changed by!, To show one number as a % of another-!, Divide the first number by the second then times by 100 to show one number as a% of another, To show compound interest as a %-!, Divide the % by 100, add this to 1, times the number by itself based on the number of years, then times by original amount to work out interest as a %!, To find the shared numbers in a ratio-!, Divide the amount shared by the sum of all the parts, then times it by how much each person gets to find a ratio!, To find the area of a triangle-!, Height x width, divided by 2 to find the area of a triangle!, To find the area of a circle-!, 3.14 x radius x radius to find the area of a circle!, To find the circumference of a circle-!, 3.14 x diameter to find the circumference of a circle!, To find the volume of a cube-!, Length x width x height to find the volume of a cube!, To find the volume of a cylinder-!, 3.14 x radius x radius x height to find the volume of a cylinder!, To find the mean number-!, Add all the values up, then divide by how many there are to find the mean number!, To find the probability of something-!, Divide the number of outcomes you want by the total number of outcomes to find the probability of something!, To find multiple probabilities-!, Find the probability of both events and times them together to find multiple probabilities!, To find the scale distance of a map drawing!, Divide real-life distance by the measured distance on the map – then write it in the form 1 cm : [real distance].

Maths recap (RED)

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