MATH’S - PAPER 2 GCSE
When you square root a number the answer must be shown as - Positive or negative
how to work out percentage change - % increase = Increase ÷ Original Number × 100.
If your answer is a negative number then this is a percentage decrease.
How to simplify a ratio easily - Divide one by the other
e.g.
3420:7980
3420/7980 = 3/7
Ratio = 3:7
How to work out compound interest - Use a multiplier
e.g.
Increase by 1.5%
Amount x (1.015)^amount of years
How to work out Frequency - Frequency = Frequency density x class width
how to work out average speed of two distances - Total distance / total time
iterative process
What does
x₊₁
ₙ =
x₁ = - x₊₁
ₙ = how to get the next iteration
How to prove vectors as a straight line? - Prove one is a multiple of the other
e.g.
XY is a multiple of OX
or
XY = 1/3OX the two are parallel. Therefore they must have the same direction and must
be a straight line.
How do you work out Density? - Density = mass/volume
When you square root a number the answer must be shown as - Positive or negative
how to work out percentage change - % increase = Increase ÷ Original Number × 100.
If your answer is a negative number then this is a percentage decrease.
How to simplify a ratio easily - Divide one by the other
e.g.
3420:7980
3420/7980 = 3/7
Ratio = 3:7
How to work out compound interest - Use a multiplier
e.g.
Increase by 1.5%
Amount x (1.015)^amount of years
How to work out Frequency - Frequency = Frequency density x class width
how to work out average speed of two distances - Total distance / total time
iterative process
What does
x₊₁
ₙ =
x₁ = - x₊₁
ₙ = how to get the next iteration
How to prove vectors as a straight line? - Prove one is a multiple of the other
e.g.
XY is a multiple of OX
or
XY = 1/3OX the two are parallel. Therefore they must have the same direction and must
be a straight line.
How do you work out Density? - Density = mass/volume
