Think Academy has $56$ pencils and $60$ pens to give students as gifts. Each student should receive the same amount of pencils and pens, leaving no spare pens or pencils. How many students at most will be able to receive the gift? 
Overseas Competition->Knowledge Point->Number Theory Modules->Factors and Multiples->Common Factors and Common Multiples->Common Factors and the Greatest Common Factors->The Greatest Common Factor of Two Numbers