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After the trainer\textquotesingle s first whistle, the monkeys at the circus formed $$4$$ rows. There were $$4$$ monkeys in each row. After the second whistle, they rearranged themselves into $$8$$ rows. How many monkeys were there in each row after the second whistle? (2005 Math Kangaroo Problem, Level 3-4, Question \#4) 
Overseas Competition->Knowledge Point->Calculation Modules->Whole Numbers->Whole Numbers Multiplication and Division
There were $$4 \times 4 = 16$$ monkeys in total. After the second whistle, there were $$16 \div 8 = 2$$ monkeys in each row. 