Basic Math Examples

\frac{7}{15} - \frac{3}{10}

$\frac{7}{15} - \frac{3}{10}$

Step 1

To write

\frac{7}{15}

$\frac{7}{15}$ as a fraction with a common denominator, multiply by

\frac{2}{2}

$\frac{2}{2}$ .

\frac{7}{15} \cdot \frac{2}{2} - \frac{3}{10}

$\frac{7}{15} \cdot \frac{2}{2} - \frac{3}{10}$

Step 2

To write

- \frac{3}{10}

$- \frac{3}{10}$ as a fraction with a common denominator, multiply by

\frac{3}{3}

$\frac{3}{3}$ .

\frac{7}{15} \cdot \frac{2}{2} - \frac{3}{10} \cdot \frac{3}{3}

$\frac{7}{15} \cdot \frac{2}{2} - \frac{3}{10} \cdot \frac{3}{3}$

Step 3

Write each expression with a common denominator of

30

$30$ , by multiplying each by an appropriate factor of

1

$1$ .

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Step 3.1

Multiply

\frac{7}{15}

$\frac{7}{15}$ by

\frac{2}{2}

$\frac{2}{2}$ .

\frac{7 \cdot 2}{15 \cdot 2} - \frac{3}{10} \cdot \frac{3}{3}

$\frac{7 \cdot 2}{15 \cdot 2} - \frac{3}{10} \cdot \frac{3}{3}$

Step 3.2

Multiply

15

$15$ by

2

$2$ .

\frac{7 \cdot 2}{30} - \frac{3}{10} \cdot \frac{3}{3}

$\frac{7 \cdot 2}{30} - \frac{3}{10} \cdot \frac{3}{3}$

Step 3.3

Multiply

\frac{3}{10}

$\frac{3}{10}$ by

\frac{3}{3}

$\frac{3}{3}$ .

\frac{7 \cdot 2}{30} - \frac{3 \cdot 3}{10 \cdot 3}

$\frac{7 \cdot 2}{30} - \frac{3 \cdot 3}{10 \cdot 3}$

Step 3.4

Multiply

10

$10$ by

3

$3$ .

\frac{7 \cdot 2}{30} - \frac{3 \cdot 3}{30}

$\frac{7 \cdot 2}{30} - \frac{3 \cdot 3}{30}$

\frac{7 \cdot 2}{30} - \frac{3 \cdot 3}{30}

$\frac{7 \cdot 2}{30} - \frac{3 \cdot 3}{30}$

Step 4

Combine the numerators over the common denominator.

\frac{7 \cdot 2 - 3 \cdot 3}{30}

$\frac{7 \cdot 2 - 3 \cdot 3}{30}$

Step 5

Simplify the numerator.

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Step 5.1

Multiply

7

$7$ by

2

$2$ .

\frac{14 - 3 \cdot 3}{30}

$\frac{14 - 3 \cdot 3}{30}$

Step 5.2

Multiply

- 3

$- 3$ by

3

$3$ .

\frac{14 - 9}{30}

$\frac{14 - 9}{30}$

Step 5.3

Subtract

9

$9$ from

14

$14$ .

\frac{5}{30}

$\frac{5}{30}$

\frac{5}{30}

$\frac{5}{30}$

Step 6

Cancel the common factor of

5

$5$ and

30

$30$ .

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Step 6.1

Factor

5

$5$ out of

5

$5$ .

\frac{5 (1)}{30}

$\frac{5 (1)}{30}$

Step 6.2

Cancel the common factors.

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Step 6.2.1

Factor

5

$5$ out of

30

$30$ .

\frac{5 \cdot 1}{5 \cdot 6}

$\frac{5 \cdot 1}{5 \cdot 6}$

Step 6.2.2

Cancel the common factor.

$\frac{5 \cdot 1}{5 \cdot 6}$

Step 6.2.3

Rewrite the expression.

$\frac{1}{6}$

Step 7

The result can be shown in multiple forms.

Exact Form:

$\frac{1}{6}$

Decimal Form:

$0.1\overline{6}$