Formula Sheet

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GCSE Maths Formula Sheet

Rule 1: When you multiply indices of the same number you add the powers.

For example: 54x 53= 54+3= 57

Rule 2: When you divide indices of the same number you subtract the powers.

For example:

Rule 1

Rule 3: Indices outside a bracket multiply.

For example: (32)4 = 32 x 4 = 38

Rule 4: Negative indices mean reciprocal, i.e. 'one over....' or 'put on the bottom of a fraction'.

For example:

Formula 1

Rule 5: When the power is a fraction the top of the fraction (numerator) is a power and the bottom of the fraction is a root.

For example:

sum

Rule 6: Anything to a power of 1 is just itself and we normally don't bother putting the 1 there.

For example: 51 is just 5.

Anything to a power of 0 is equal to 1, it doesn't matter what number it is!

For example: 100 = 1, 20 = 1, x0 = 1, etc.

nth term = dn + (a - d)

For example: 6, 11, 16, 21, ... for this sequence d = 5, a = 6

Rule 1: Angles around a single point add up to 360°.

Rule 2: Angles on a straight line add up to 180°.

Rule 3: Vertically opposite angles are equal. (This is when two straight lines cross!).

Rule 4: Angles in a triangle add up to 180°.

Rule 5: Angles in a quadrilateral add up to 360°.

When a straight line crosses two parallel lines there are more angle facts we can look for and use!

Rule 1: Corresponding angles are equal - these are angles in a letter 'F'.

Rule 2: Alternate angles are equal - these are angles in a letter 'Z'.

Rule 3: Supplementary angles add up to 180° - these are angles in a letter 'U' or 'C' (when the 'U' and the 'C' are made of three straight sides, of course).

SOHCAHTOA

Rule 1: Sine is Opposite over Hypotenuse

Rule 2: Cos is Adjacent over Hypotenuse

Rule 3: Tan is Opposite over Adjacent

Rule:

The square on the hypotenuse is equal to the sum of the squares on the other two sides

or, a2 + b2 = c2

Square: Area = Length2

Rectangle: Area = Length x Width

Right-angled Triangle: Area = ½ x Base x Height

Other Triangle: Area = ½ x Base x Perpendicular Height

Circle: Area = π r2

Trapezium: Area = Average of Parallel sides x Distance between them

Curved Surface of a Cylinder: Area = 2π rh

Surface of a Sphere: Area = 4π r2

Curved Surface of a Cone: Area = π rl

Cube: Volume = Length3

Cuboid: Volume = Length x Width x Height

Prism: Volume = Area of Cross-section x Length

Cylinder: Volume = π r2h

Sphere: Volume = 4/3π r3

Prism: Volume = 1/3π r2h

For a regular polygon with 'n' sides, External angle:

sum

For a regular polygon with 'n' sides, Internal angle:

Sum

Circumference = 2π r or, Circumference = πd

Area = π r2

Sum

The equation of a straight line is y = mx + c

The gradient, m:

Sum

Quadratic functions are written in the form y = ax2 + bx + c

Cubics are in the form y = ax3 + bx2 + cx + d

In a pie chart, to find out the frequency that each section represents measure the angle for the section then:

Sum

If we call a particular event 'A' then the probability of A happening is:

Sum

The 'and' rule:

p (A and B) = p (A) x p (B)

The 'or' rule:

p (A or B) = p (A) + p (B)

GCSE Maths Banana skins - Don't slip up!

Students keep making the same mistakes in their GCSE Maths exams. Inspired by the examiner's reports find out where students are losing vital marks, so that you can avoid the common slip-ups!

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