Not sure what a meater is, but if you mean metre (US = meter), then the answer is none.
A metre is a measure of length, whereas a femtogram is a measure of mass. The two measure different things and, according to the basic rules of dimensional analysis, conversion from one to the other is not valid.
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100
approximately 3.28084 (rounded)
There are 100 centimetres in a metre.
Who knows? But one tenth of a metre (or meter) is a decimetre.
5*3 = 15 square meters