3/4-7/20

Let's evaluate:

\frac{3}{4} - \frac{7}{20}

ⓘ To add fractions, put them over the same denominator, then add the numerators. We choose

20

, the least common multiple of

4

and

20

. Multiplying the numerator and the denominator by the same number does not change the fraction:

\frac{3}{4} - \frac{7}{20}

\frac{3 \times 5}{4 \times 5} - \frac{7}{20}

\frac{3 \times 5 - 7}{20}

\frac{3 \times 5 - 7}{20}

ⓘ Multiplications are done before additions and subtractions:

3 \times 5

15

\frac{15 - 7}{20}

ⓘ Calculate the numerator and denominator before dividing:

15 - 7

8

\frac{8}{20}

ⓘ We simplify the fraction by dividing the numerator and the denominator by

4

, their greatest common divisor:

\frac{8}{20}

\frac{2 \times 4}{5 \times 4}

\frac{2}{5}

▶Result:

\frac{2}{5}

The numeric value of:

\frac{2}{5}

equals:

▷

0.4

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