4/5-7/20

Let's calculate: $\frac{4}{5}-\frac{7}{20}$

ⓘ 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: $\frac{4}{5}-\frac{7}{20}$ = $\frac{4\times 4}{5\times 4}-\frac{7}{20}$ = $\frac{4\times 4-7}{20}$

$\frac{4\times 4-7}{20}$

ⓘ Multiplications are done before additions and subtractions: $4\times 4$ = $16$

$\frac{16-7}{20}$

ⓘ Calculate the numerator and denominator before dividing: $16-7$ = $9$

▶Result:   $\frac{9}{20}$

The numeric value of: $\frac{9}{20}$ equals:

▷ $0.45$