$\text{a)}$  

$5\text{mm}=5\cdot {10}^{-3}\text{m}$  

$2\text{ns}=2\cdot {10}^{-9}\text{s}$  

$10\text{pK}=10\cdot {10}^{-12}\text{K}=1\cdot 10\cdot {10}^{-12}\text{K}=1\cdot {10}^{1+\left(-12\right)}\text{K}=1\cdot {10}^{1-12}\text{K}=1\cdot {10}^{-11}\text{K}$  

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$\text{b)}$  

$0,1\text{fm}=0,1\cdot {10}^{-15}\text{m}=1\cdot 0,1\cdot {10}^{-15}\text{m}=1\cdot {10}^{-1}\cdot {10}^{-15}\text{m}=1\cdot {10}^{-1+\left(-15\right)}\text{m}=$  

$=1\cdot {10}^{-1-15}\text{m}=1\cdot {10}^{-16}\text{m}$  

$0,5\mu \text{g}=0,5\cdot {10}^{-6}\text{g}=5\cdot 0,1\cdot {10}^{-6}\text{g}=5\cdot {10}^{-1}\cdot {10}^{-6}\text{g}=5\cdot {10}^{-1+\left(-6\right)}\text{g}=$  

$=5\cdot {10}^{-1-6}\text{g}=5\cdot {10}^{-7}\text{g}$  

$0,01\text{aA}=0,01\cdot {10}^{-18}\text{A}=1\cdot 0,01\cdot {10}^{-18}\text{A}=1\cdot {0,1}^2\cdot {10}^{-18}\text{A}=1\cdot {10}^{-2}\cdot {10}^{-18}\text{A}=$  

$=1\cdot {10}^{-2+\left(-18\right)}\text{A}=1\cdot {10}^{-2-18}\text{A}=1\cdot {10}^{-20}\text{A}$  

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$\text{c)}$  

$200\text{ym}=200\cdot {10}^{-24}\text{m}=2\cdot 100\cdot {10}^{-24}\text{m}=2\cdot {10}^2\cdot {10}^{-24}\text{m}=2\cdot {10}^{2+\left(-24\right)}\text{m}=$  

$=2\cdot {10}^{2-24}\text{m}=2\cdot {10}^{-22}\text{m}$  

$1\text{zmol}=1\cdot {10}^{-21}\text{mol}$  

$30\text{fcd}=30\cdot {10}^{-15}\text{cd}=3\cdot 10\cdot {10}^{-15}\text{cd}=3\cdot {10}^{1+\left(-15\right)}\text{cd}=3\cdot {10}^{1-15}\text{cd}=3\cdot {10}^{-14}\text{cd}$