Systematic nomenclature of cycloalkanes

The procedure used to name a cycloalkane by the IUPAC method is very similar to that used for alkanes. Here, the root designates the number of carbons in the ring and the prefix cyclo- is attached to indicate that the compound contains a ring. The rules for numbering the ring carbons are as follows  

No number is needed if only one group is attached to the ring. 

For rings with multiple substituents, begin numbering at one substituent and proceed in the direction that gives the lowest numbers to the remaining substituents. 

In cases in which the alkyl chain has more carbons than the ring, the compound is named as an alkane with the ring as a substituent group with a -yl suffix. 

Draw structures for these compounds a) 1.1-Dimethylcyclohexane b) Ethylcyclopropane 

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