Do you know your fractions

$\dfrac{1}{4} \times \dfrac{1}{2} \times \dfrac{1}{5} \times 200$

$\dfrac{1}{4} \times \dfrac{1}{2} \times \dfrac{1}{5} \times \dfrac{200}{1}$

$\dfrac{1 \times 1 \times 1\times 200}{4 \times 2 \times 5 \times 1 }$

$\dfrac{200}{2 \times 4 \times 5}$

$\dfrac{20\not{0}}{4\not{0}}$

$\dfrac{20}{4}$

$= \boxed{5}$

$\dfrac{1}{5}$ of $200$ = $\dfrac{1}{5} \times 200 = 40$

$\dfrac{1}{2}$ of $40$ = $\dfrac{1}{2} \times 40 = 20$

$\dfrac{1}{4}$ of $20$ = $\dfrac{1}{4} \times 20 = 5$

$0.25 * 0.5 * 0.2 * 200 = 5$