Having gotten full understanding on the theory of indices. In solving the indices involving multiplication and division, you will need to apply the law of DIVISION AND MULTIPLICATION with other related law 

Here is another form of indices, in which the unknown variable that's the one to find is written at index or as a power.  Hope it's helpful, let's know in the comments section. You can learn more about the theory of indices

  Ionic Bonding: The other name of Ionic bonding is electrovalent bonding; the molecular linkages are formed by the electrostatic attraction among oppositely charged ions. The attraction phenomenon is influenced by the formation of bond between molecules with the help of complete valence electron transfer from one atom to another. The atom which loses electron(s) are positively charged and named as cation and the one that gains electron(s) are named as anion which have negative charge. The best ionic bonding can be seen in the combination of non-metals, alkali and alkaline-earth metals. In molecular formation, like charges gets repulsed and those being oppositely charged, gets attracted in which each positive ion is surrounded by negative ions in attraction forming a net zero balance of ions for the stable ionic compound. The ionic bonds are also referred as extreme form of covalent bond, which happens only during a great difference in electronegativity of the participating atoms. ...

Indices is the plural form of index. It's characteristics by law. You can simply solve an indices by applying the law that binds it           Hope it's helpful. Can I know in the comments section. Question is also allowed. See more of this, multiplication and division of indices