Vi skriver alle seks tallene om til standardform $a \cdot 10^n$ der $1 \leq a < 10$, og sammenligner eksponentene.

250 millioner:

$$250\,000\,000 = 2{,}5 \cdot 10^{8}$$

$2500 \cdot 10^{7}$:

$$2500 \cdot 10^{7} = 2{,}5 \cdot 10^{3} \cdot 10^{7} = 2{,}5 \cdot 10^{10}$$

$\dfrac{25}{100000}$:

$$\frac{25}{100\,000} = \frac{25}{10^{5}} = 25 \cdot 10^{-5} = 2{,}5 \cdot 10^{-4}$$

$0{,}25 \cdot 10^{10}$:

$$0{,}25 \cdot 10^{10} = 2{,}5 \cdot 10^{-1} \cdot 10^{10} = 2{,}5 \cdot 10^{9}$$

$0{,}250 \cdot 10^{-5}$:

$$0{,}250 \cdot 10^{-5} = 2{,}5 \cdot 10^{-1} \cdot 10^{-5} = 2{,}5 \cdot 10^{-6}$$

$0{,}0025\,\%$:

$$0{,}0025\,\% = \frac{0{,}0025}{100} = 0{,}000025 = 2{,}5 \cdot 10^{-5}$$

Oversikt:

Opprinnelig form	Standardform
$0{,}250 \cdot 10^{-5}$	$2{,}5 \cdot 10^{-6}$
$0{,}0025\,\%$	$2{,}5 \cdot 10^{-5}$
$\dfrac{25}{100000}$	$2{,}5 \cdot 10^{-4}$
$250 \text{ millioner}$	$2{,}5 \cdot 10^{8}$
$0{,}25 \cdot 10^{10}$	$2{,}5 \cdot 10^{9}$
$2500 \cdot 10^{7}$	$2{,}5 \cdot 10^{10}$

Alle tallene har $a = 2{,}5$, så vi sammenligner bare eksponentene: $-6 < -5 < -4 < 8 < 9 < 10$.

Stigende rekkefølge:

$$\underline{\underline{0{,}250 \cdot 10^{-5} \;<\; 0{,}0025\,\% \;<\; \frac{25}{100000} \;<\; 250 \text{ millioner} \;<\; 0{,}25 \cdot 10^{10} \;<\; 2500 \cdot 10^{7}}}$$