3/5+1/20

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

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

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

ⓘ Multiplications are done before additions and subtractions: $3\times 4$ = $12$

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

ⓘ The numerator and the denominator are computed before the division: $12+1$ = $13$

▶Result:   $\frac{13}{20}$

The numeric value of: $\frac{13}{20}$ is:

▷ $0.65$