a)

Skoro $1\mathrm{km}=1000\text{m}=100000\mathrm{cm},$ to:

$10\mathrm{km}=1\underset{6\text{ zer}}{\underbrace{000000}}\mathrm{cm}=10^{\boxed{6}}$

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b)

Skoro $1\text{t}=1000\mathrm{kg},$ to:

$10\text{t}=1\underset{4\text{ zera}}{\underbrace{0000}}\mathrm{kg}=10^{\boxed{4}}\text{kg}$

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c) 

Skoro $1\text{m}=100\mathrm{cm}=1000\mathrm{mm},$ to:

$100\text{m}=1\underset{5\text{ zer}}{\underbrace{00000}}\mathrm{mm}=10^{\boxed{5}}\mathrm{mm}$

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d)

Skoro $1\text{g}=0,001\mathrm{kg}=0,000001\text{t,}$ to:

$1\text{g}=0,\underset{6\text{ cyfr}}{\underbrace{000001}}\text{t}=0,1^{\boxed{6}}\text{t}$

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e)

Skoro $1\text{g}=0,1\text{dag},$ to:

$10\text{g}=1\text{dag}=0,1^{\boxed{0}}\text{dag}$, bo dla dowolnej liczby $a\ne 0$ mamy $a^0=1.$

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f)

Skoro $1\text{dm}=0,0001\mathrm{km},$ to:

$\begin{array}{c}\underset{3\text{ cyfry}}{10\text{dm}=0,\underline{001}\text{km}=0,1^{\boxed{3}}\text{km}}\end{array}$