Kuulchat - Senior High School (S.H.S) Mathematics Numbers Practice Test Questions

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NUMBERS

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1.

Which of the following is not a rational number?

A.

-5

B.

$\sqrt{4}$

C.

3 $\frac{3}{4}$

D.

$\sqrt{90}$

Rational Number

A rational number is any number that can be expressed as a fraction, where both the numerator and denominator are integers.

-5 = $\frac{-5}{1}$ hence is a rational number

$\sqrt{4}$ = 2 = $\frac{2}{1}$ hence is a rational number

3 $\frac{3}{4}$ = $\frac{3 x 4 + 3}{4}$ = $\frac{12 + 3}{4}$ = $\frac{15}{4}$ hence is a rational number

$\sqrt{90}$ = 9.4868 hence not a rational number since can't be expressed as a fraction of two integers.

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NUMBERS

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