The first thing is to correct those who have replied and, quite worryingly, have adopted the americanisation of the word mathematics as 'math'
Mathematics has an 's' on the end and it is shortened to Maths.
In order to teach division, you have to do 2 things.
1. reinforce the multip;lication facts, as a child (or adult) who is unable to recall that 7 x 4 is 28, will struggle to solve 'what is 28 divided by 7?'
2. A metod, or algorithm has to be taught, such as chunking. This where we again use multiplication facts. So, to divide 216 by 8, we teach that 10 x 8 = 80 and we still need anpother 136, so we chunk again. 10 x 8 is 80 again, leaving 56.
An able pupil will know that 7 x 8 = 56 and so the answer is 10 + 10 +7 = 27.
Alternatively, you use one of the traditional long or short division techniques.
However, the child needs to understand the Maths that is happpening and that we are 'sharing' 216 by 8 or finding how many times 8 will go into 216.
Use of inverse is also good. i.e. if 7 x 8 = 56 then 56 divided by 7 is 8 and 56 divided by 8 is 7.
Division is a difficult technique and also needs support in discussing 'what is happening' and relating to real life.