17/18-8/9

Let's evaluate: $\frac{17}{18}-\frac{8}{9}$

ⓘ Add fractions by using a common denominator and then adding their numerators. We choose $18$, the least common multiple of $18$ and $9$. Multiplying the numerator and the denominator by the same number does not change the fraction: $\frac{17}{18}-\frac{8}{9}$ = $\frac{17}{18}-\frac{8\times 2}{9\times 2}$ = $\frac{17-8\times 2}{18}$

$\frac{17-8\times 2}{18}$

ⓘ Perform multiplications before additions and subtractions: $8\times 2$ = $16$

$\frac{17-16}{18}$

ⓘ The numerator and the denominator are computed before the division: $17-16$ = $1$

▶Result:   $\frac{1}{18}$

The numeric value of: $\frac{1}{18}$ is:

▷ $\approx 5.5556\times {10}^{-2}$