Simplify b/15*21/b

$\frac{b}{15} \cdot \frac{21}{b}$

Step 1

Cancel the common factor of $b$ .

Cancel the common factor.

$\frac{b}{15} \cdot \frac{21}{b}$

Rewrite the expression.

$\frac{1}{15} \cdot 21$

$\frac{1}{15} \cdot 21$

Step 2

Cancel the common factor of $3$ .

Factor $3$ out of $15$ .

$\frac{1}{3 (5)} \cdot 21$

Factor $3$ out of $21$ .

$\frac{1}{3 \cdot 5} \cdot (3 \cdot 7)$

Cancel the common factor.

$\frac{1}{3 \cdot 5} \cdot (3 \cdot 7)$

Rewrite the expression.

$\frac{1}{5} \cdot 7$

$\frac{1}{5} \cdot 7$

Step 3

Combine $\frac{1}{5}$ and $7$ .

$\frac{7}{5}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$\frac{7}{5}$

Decimal Form:

$1.4$

Mixed Number Form:

$1 \frac{2}{5}$

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