hmmmm.....lets do 12 divided by -4. It seems impossible to do right? Well as a matter of fact it is possible. Try to do that question on your calculator. No, don't worry your calculator won't blow up! It works!
From what I understand, there are 4 easy steps to doing Multiplicative Inverse. First write the question using the division sign. Step 2 switch the answer(N) and the first integer and change the division sign to a multiplication sign. Step 3 Find the answer to N. Then fill in the question.

Your probably wondering what's wrong with just using partitive or quotative division. Well I'll tell you what's wrong: They don't work!
Quotative: How many -4's are in +12? It doesn't work because we can't make groups of -4 in a positive number.
Partitive: How many equal parts are in -4 groups when we have +12? It doesn't work either, because you can't draw -4 groups.
Let me think...........................................the next scribe is Maeddah!!!!!!!!!!!!!!!!!!!=P
Chapter 3: One Step equation solving