integer, A whole number, positive, negative or zero., natural number, A positive whole number used for counting., rational number, A number that can be written as a fraction of two integers., irrational number, A number that cannot be written as a simple fraction., real number, Any number that can be represented on the number line., fraction, A number representing part of a whole or a ratio of two numbers., numerator, The number above the line in a fraction., denominator, The number below the line in a fraction., decimal, A way of writing numbers using a decimal point., percentage, A number expressed as a fraction of 100., ratio, A comparison between two quantities., proportion, A relationship showing that two ratios are equal., power / exponent, A number showing how many times a number is multiplied by itself., square root, A number that produces the original number when multiplied by itself., scientific notation, A way of writing very large or very small numbers using powers of ten., 3,500,000 = 3.5 × 10⁶, Three million five hundred thousand equals three point five times ten to the power of six.

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