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Percentage of an amount
percent x amount
100
Density
mass
volume
Turn a fraction into a percentage
fraction x 100
Percentage change
change x 100
original
Area of a trapezium
a + b x height
2
Area of a parallelogram
base x height
Volume of a prism
cross sectional area x height (or length depending on your shape)
Weight (using mass)
mass x 10
Pressure
force
area
Capture-Recapture
Initially tagged = Recapture tagged
Population (x) sample size
Position of median
Number of items + 1
2
Lower quartile
(n + 1) th value
4
Upper quartile
3(n + 1) th value
4
Mean
total fx
total f
Circumference of a sector
angle x 2πr
360
Area of a sector
angle x πr²
360
Compound interest
starting money x multiplier^number of years
Area of a circle
πr²
Area of a triangle
base x height
2
