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An entity-relationship diagram of a grading system can be viewed by visiting this website at http://stackoverflow.com/questions/9486156/er-diagram-for-grading-system. There is information included with the diagram about the grading system.
1 and any factors that are themselves composite since none of these are prime.
A factor tree
You use it when you copare certain things such as factors of numbers.
It is: 2*2*2*2*2 = 32