9/10-1/18

Let's calculate:

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

ⓘ Add fractions by using a common denominator and then adding their numerators. We choose

90

, the least common multiple of

10

and

18

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

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

\frac{9 \times 9}{10 \times 9} - \frac{1 \times 5}{18 \times 5}

\frac{9 \times 9 - 1 \times 5}{10 \times 9}

\frac{9 \times 9 - 1 \times 5}{10 \times 9}

ⓘ Multiplications are done before additions and subtractions:

9 \times 9

81

1 \times 5

5

ⅰ

10 \times 9

90

\frac{81 - 5}{90}

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

81 - 5

76

\frac{76}{90}

ⓘ Simplify the fraction by dividing the numerator and the denominator by

2

, their greatest common divisor:

\frac{76}{90}

\frac{38 \times 2}{45 \times 2}

\frac{38}{45}

▶Result:

\frac{38}{45}

The numeric value of:

\frac{38}{45}

equals:

▷

\approx 0.8444

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