Approximate - Not exact, but close enough to be used., Average - A calculated "central" value of a set of numbers., Calculate - To work out an answer, usually by adding, multiplying etc., Equivalent - Having the same value., Significant - Meaningful and important., Simplify - To make something as simple as possible. , Discrete - Data that which can be counted and can only take certain values., Estimate - Round values to 1 significant figure before carrying out a calculation., Expression - Terms, numbers, symbols and operators grouped together without an equals sign., Integer - A whole number which can be positive or negative., Frequency - The number of times something occurs. , Quadratic - Where the highest power of the variable (usually "x") is a square (2).,

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