1/20-3/5

Let's evaluate: $\frac{1}{20}-\frac{3}{5}$

ⓘ Add fractions by using a common denominator and then adding their numerators. We choose $20$, the least common multiple of $20$ and $5$. Multiplying the numerator and the denominator by the same number does not change the fraction: $\frac{1}{20}-\frac{3}{5}$ = $\frac{1}{20}-\frac{3\times 4}{5\times 4}$ = $\frac{1-3\times 4}{20}$

$\frac{1-3\times 4}{20}$

ⓘ Perform multiplications before additions and subtractions: $3\times 4$ = $12$

$\frac{1-12}{20}$

ⓘ Calculate the numerator and denominator before dividing: $1-12$ = $-11$

▶Result:   $-\frac{11}{20}$

The numeric value of: $-\frac{11}{20}$ equals:

▷ $-0.55$