Algebra 1

To which subset(s) does the number –square root of twenty belong? Choose all that apply.

(Irrational Numbers
(Rational Numbers***
(Integers***
(Whole Numbers
(Natural Numbers

The maximum of choices is 2

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  1. THINK

    square root of 2 (about 1.414213562) can NOT be expressed as a ratio of two whole numbers

    square root of ten can NOT be expressed as ratio of two whole numbers

    THEREFORE

    square root of two * square root of ten which is square root of twenty can NOT be expressed as the ratio of two whole numbers

    THEREFORE
    square root of twenty is IRRATIONAL

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  2. 2 sqrt 5 = sqrt 20
    sqrt 5 = 2.236067977
    IRRATIONAL

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  3. http://www.dictionary.com/browse/irrational--number

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