maths revision

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Maths revision Formula Image: Maths Teacher Uxbridge (image/png)	The plural of formula is formulae. A formula is a mathematical rule or relationship that uses letters to represent amounts which can be changed – these are called variables. For example, the formula to work out the area of a triangle.
Scalene triangle with b (base) and height (h) labelledScalene triangle with b (base) and height (h) labelled	Formulae contain equals signs, as do equations, so it can sometimes be difficult to tell the difference between an equation and a formula.
A formula is a calculation for a specific purpose, for example converting Fahrenheit to Celsius or vice versa. A formula is also always true, no matter what values are put in.	An equation will only work for certain values, and is not always true. For example, the equation Equation: 2x + 5 = 13 will only be true if Equation: x is equal to 4. If any other value is put in, then the equation will no longer be correct.
Substitution Substitution means putting numbers in place of letters to calculate the value of an expression.	For example, in the expression Equation: 2b^2c, where Equation: b = 4 and Equation: c = 3, use the values of Equation: b and Equation: c to calculate the numerical value of the expression: Equation: 2b^2c = 2 times b^2 times c

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