Basic Math Examples

$\frac{12}{21} - \frac{4}{7}$

Step 1

Cancel the common factor of $12$ and $21$ .

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Step 1.1

Factor $3$ out of $12$ .

$\frac{3 (4)}{21} - \frac{4}{7}$

Step 1.2

Cancel the common factors.

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Step 1.2.1

Factor $3$ out of $21$ .

$\frac{3 \cdot 4}{3 \cdot 7} - \frac{4}{7}$

Step 1.2.2

Cancel the common factor.

$\frac{3 \cdot 4}{3 \cdot 7} - \frac{4}{7}$

Step 1.2.3

Rewrite the expression.

$\frac{4}{7} - \frac{4}{7}$

Step 2

Combine the numerators over the common denominator.

$\frac{4 - 4}{7}$

Step 3

Simplify the expression.

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Step 3.1

Subtract $4$ from $4$ .

$\frac{0}{7}$

Step 3.2

Divide $0$ by $7$ .

$0$