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prealgebra intermediate

Problem

The number halfway between

1/8

and

1/10

is

(A)

\frac{1}{80}

(B)

\frac{1}{40}

(C)

\frac{1}{18}

(D)

\frac{1}{9}

(E)

\frac{9}{80}

Solution

To find the number halfway between

\frac{1}{8}

and

\frac{1}{10}

, simply take the arithmetic mean, which is

\frac{\frac{1}{8} + \frac{1}{10}}{2} = \frac{\frac{9}{40}}{2} = \frac{9}{80} .

Thus the answer is choice

\frac{9}{80} .

Final answer

E