I believe it would be 10 hectometers
[ explanation ]
I use an easy method which is
King(kilo)Henry(hecto) Dies Mother(meters) Doesn't Care(centi) much(milli) you start at the letter you are converting then jump each letter at a time to the letter you want it converted to then count the number of jumps and use that number to move the decimal of the number right ( if we're going right with the letters) or left( if left in letters)
Example
20 meters to centimetres
K H D M D C M
_- -_
(- = the number of jumps/ the jumps, ) ( _= the letter we are converting and converting to)
Since we have two jumps from M(meters )to C (centimetres)
We take the # 20 and jump two times and since we're going to the right you move the decimal to the right
20.00 1) 200.0 2)2000.0
So 20 meters equals 2000 centimetres
