1/20-11/16

Let's calculate: $\frac{1}{20}-\frac{11}{16}$

ⓘ Add fractions by using a common denominator and then adding their numerators. We choose $80$, the least common multiple of $20$ and $16$. Multiplying the numerator and the denominator by the same number does not change the fraction: $\frac{1}{20}-\frac{11}{16}$ = $\frac{1\times 4}{20\times 4}-\frac{11\times 5}{16\times 5}$ = $\frac{1\times 4-11\times 5}{20\times 4}$ = $\frac{4-11\times 5}{20\times 4}$

$\frac{4-11\times 5}{20\times 4}$

ⓘ Perform multiplications before additions and subtractions: $11\times 5$ = $(10+1)\times 5$ = $10\times 5+5$ = $50+5$ = $55$

ⅰ $20\times 4$ = $80$

$\frac{4-55}{80}$

ⓘ The numerator and the denominator are computed before the division: $4-55$ = $-51$

▶Result:   $-\frac{51}{80}$

The numeric value of: $-\frac{51}{80}$ is:

▷ $-0.6375$