7/9-17/18

Let's calculate:

\frac{7}{9} - \frac{17}{18}

ⓘ Add fractions by using a common denominator and then adding their numerators. We choose

18

, the least common multiple of

9

and

18

. Multiplying the numerator and the denominator by the same number does not change the fraction:

\frac{7}{9} - \frac{17}{18}

\frac{7 \times 2}{9 \times 2} - \frac{17}{18}

\frac{7 \times 2 - 17}{18}

\frac{7 \times 2 - 17}{18}

ⓘ Multiplications are done before additions and subtractions:

7 \times 2

14

\frac{14 - 17}{18}

ⓘ Calculate the numerator and denominator before dividing:

14 - 17

-3

- \frac{3}{18}

ⓘ We simplify the fraction by dividing the numerator and the denominator by

3

, their greatest common divisor:

- \frac{3}{18}

- \frac{1 \times 3}{6 \times 3}

- \frac{1}{6}

▶Result:

- \frac{1}{6}

The numeric value of:

- \frac{1}{6}

equals:

▷

\approx -0.1667

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