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maths revision
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- 1Maths revision FormulaThe 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.
- 2Scalene triangle with b (base) and height (h) labelledScalene triangle with b (base) and height (h) labelledFormulae contain equals signs, as do equations, so it can sometimes be difficult to tell the difference between an equation and a formula.
- 3A 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.
- 4Substitution 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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- Year 10 Maths Fichas sobre maths revision, creado por alliaya proctor el 23/06/2017.
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- alliaya proctor
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