# The Daily Value for phosphorus is 800 mg. How many grams of phosphorus are recommended?

Feb 1, 2017

$= \frac{4}{5} g \mathmr{and} 0.8 g$

#### Explanation:

$1 g = 1000 m g$

$\therefore 1 m g = \frac{1}{1000} g$

$800 m g = \frac{1}{1000} g \cdot 800$

$= \frac{800}{1000} g$

$= \frac{8}{10} g$

$= \frac{4}{5} g \mathmr{and} 0.8 g$

Feb 1, 2017

$0.800 \cdot g$

#### Explanation:

$\text{mg}$ $\equiv$ $\text{milligram}$ $\equiv$ ${10}^{-} 3 \cdot g$.

Clearly, there are ${10}^{3} \cdot m g \cdot {g}^{-} 1$.

And thus $\frac{800 \cdot \cancel{m g}}{{10}^{3} \cdot \cancel{m g} \cdot {g}^{-} 1} = 0.800 \cdot g .$

(Because $\frac{1}{{g}^{-} 1} = \frac{1}{\frac{1}{g}} = g$ as required...........)