Basic Math Examples

4.2 cm = 42 mm

$4.2 cm = 42 mm$

Step 1

Convert

mm

$mm$ to

cm

$cm$ .

4.2 cm = 42 mm \times \frac{1 cm}{10 mm}

$4.2 cm = 42 mm \times \frac{1 cm}{10 mm}$

Step 2

Cancel the common units and simplify.

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Step 2.1

Cross cancel units.

$4.2 cm = \frac{42 mm}{1} \times \frac{1 cm}{10 mm}$

Step 2.2

Simplify the expression.

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Step 2.2.1

Remove the canceled units.

$4.2 cm = \frac{42}{1} \times \frac{1 cm}{10}$

Step 2.2.2

Combine fractions.

$4.2 cm = \frac{42}{10} cm$

Step 2.2.3

Cancel the common factor of

$42$ and

$10$ .

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Step 2.2.3.1

Factor

$2$ out of

$42$ .

$4.2 cm = \frac{2 (21)}{10} cm$

Step 2.2.3.2

Cancel the common factors.

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Step 2.2.3.2.1

Factor

$2$ out of

$10$ .

$4.2 cm = \frac{2 \cdot 21}{2 \cdot 5} cm$

Step 2.2.3.2.2

Cancel the common factor.

$4.2 cm = \frac{2 \cdot 21}{2 \cdot 5} cm$

Step 2.2.3.2.3

Rewrite the expression.

$4.2 cm = \frac{21}{5} cm$

$4.2 cm = \frac{21}{5} cm$

$4.2 cm = \frac{21}{5} cm$

$4.2 cm = \frac{21}{5} cm$

Step 2.3

Convert to decimal.

$4.2 cm = 4.2 cm$

$4.2 cm = 4.2 cm$

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