explain 1/18-9/20 — step-by-step solution

Let's calculate:

\frac{1}{18} - \frac{9}{20}

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

\frac{1 \times 10 - 9 \times 9}{18 \times 10}

ⓘMultiplications are done before additions and subtractions:

-9 \times 9

-81

‖

18 \times 10

(10 + 8) \times 10

10 \times 10 + 8 \times 10

100 + 80

180

ℹ

1 \times 10

10

\frac{10 - 81}{180}

ⓘThe numerator and the denominator are computed before the division:

10 - 81

-71

▶Result:

- \frac{71}{180}

The numeric value of:

- \frac{71}{180}

equals:

▷

\approx -0.3944