1/3-3/20

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

ⓘ To add fractions, put them over the same denominator, then add the numerators. We choose $60$, the least common multiple of $3$ and $20$. Multiplying the numerator and the denominator by the same number does not change the fraction: $\frac{1}{3}-\frac{3}{20}$ = $\frac{1\times 20}{3\times 20}-\frac{3\times 3}{20\times 3}$ = $\frac{1\times 20-3\times 3}{3\times 20}$ = $\frac{20-3\times 3}{3\times 20}$

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

ⓘ Multiplications are done before additions and subtractions: $3\times 3$ = $9$

ⅰ $3\times 20$ = $60$

$\frac{20-9}{60}$

ⓘ Calculate the numerator and denominator before dividing: $20-9$ = $11$

▶Result:   $\frac{11}{60}$

The numeric value of: $\frac{11}{60}$ equals:

▷ $\approx 0.1833$