maths formula cheat sheet

percentage

( part/whole) x 100

ratio

a : b

finance

simple interest, compound interest, hire purchase, VAT, inclu and exclu price

simple interest

A = P (1+ i x n)

compound interest

A = P (1 +i)^n

hire purchase 

total cost = deposit + (payment x months)

inclu. price 

inclu price = exclu price + price

measurement

perimeter, area, volume, surface area

perimeter

sum of all sides

area 

rectangle - area = l x b 

triangle - area = ½ breath x h 

volume

rectangular prism - l x b x h

cylinder - πr²h

surface area of cylinder - 2πr² + 2πrh

maps, scale and time (DST)

actual distance = map distance x scale factor

speed = distance ÷ time

time = distance ÷ speed

distance = speed x time

data and probability

mean, median, mode, range 

 

graphs

linear equation - y = mx + c

gradient m = rise ÷ run

break even - income = expenses

simple interest and compound interest

a = total value of the investment/loan at the end of the period

p = initial amount

i = interest rate for the payment interval

n = number of payment intervals over the total period of the loan of investment