4/5-1/7

Let's calculate: $\frac{4}{5}-\frac{1}{7}$

ⓘ To add fractions, put them over the same denominator, then add the numerators. We choose $35$, the least common multiple of $5$ and $7$. Multiplying the numerator and the denominator by the same number does not change the fraction: $\frac{4}{5}-\frac{1}{7}$ = $\frac{4\times 7}{5\times 7}-\frac{1\times 5}{7\times 5}$ = $\frac{4\times 7-1\times 5}{5\times 7}$

$\frac{4\times 7-1\times 5}{5\times 7}$

ⓘ Perform multiplications before additions and subtractions: $4\times 7$ = $28$, $1\times 5$ = $5$

ⅰ $5\times 7$ = $35$

$\frac{28-5}{35}$

ⓘ Calculate the numerator and denominator before dividing: $28-5$ = $23$

▶Result:   $\frac{23}{35}$

The numeric value of: $\frac{23}{35}$ is:

▷ $\approx 0.6571$