Pre-Algebra Examples

$\frac{1}{2} - \frac{7}{8}$

Step 1

To write $\frac{1}{2}$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$\frac{1}{2} \cdot \frac{4}{4} - \frac{7}{8}$

Step 2

Write each expression with a common denominator of $8$ , by multiplying each by an appropriate factor of $1$ .

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Step 2.1

Multiply $\frac{1}{2}$ by $\frac{4}{4}$ .

$\frac{4}{2 \cdot 4} - \frac{7}{8}$

Step 2.2

Multiply $2$ by $4$ .

$\frac{4}{8} - \frac{7}{8}$

Step 3

Combine the numerators over the common denominator.

$\frac{4 - 7}{8}$

Step 4

Subtract $7$ from $4$ .

$\frac{- 3}{8}$

Step 5

Move the negative in front of the fraction.

$- \frac{3}{8}$

Step 6

The result can be shown in multiple forms.

Exact Form:

$- \frac{3}{8}$

Decimal Form:

$- 0.375$