How many multiples of $$4$$ are there from $$56$$ to $$92$$?     Below in Sam\textquotesingle s workings.  $56\div4 = 14$  There are $4$ multiples of $4$ from $1$ to $56$.  $92\div4 = 23$  There are $4$ multiples of $4$ from $1$ to $92$.  $23-14=9$  There are $9$ multiples of $4$ from $$56$$ to $$92$$.     Is Sam\textquotesingle s answers correct? If not, identify where he made his mistake and find the correct number of multiples. 
Overseas Competition->Knowledge Point->Number Theory Modules->Factors and Multiples->Basic Concepts of Factors and Multiples