How many kilometers are there in 6.2*10^7 cm?

Sep 6, 2016

$620 k m$

Explanation:

$1 k m = 1000 m \mathmr{and} 1 m = 100 c m$

So, $1 k m = 100000 c m = 1 \times {10}^{5} c m$

When you convert to a bigger unit, the number gets smaller.

$\frac{6.2 \times {10}^{7}}{1 \times {10}^{5}} = 6.2 \times {10}^{2} = 620 k m$

Or we can convert cm to metres first ($\div 100$)

Then convert metres to km ($\div 1000$)

$\left(6.2 \times {10}^{7} c m\right) \div 100 = 6.2 \times {10}^{5} m$

$\left(6.2 \times {10}^{5} m\right) \div 1000 = 6.2 \times {10}^{2} k m$

$6.2 \times {10}^{2} k m = 620 k m$