64% is the same thing as
$${\frac{{\mathtt{64}}}{{\mathtt{100}}}}$$
By dividing the top and bottom by 4, this can be reduced to
$${\frac{{\mathtt{16}}}{{\mathtt{25}}}}$$
If it helps you, think of this as a word problem.
A store has 100 pencils in stock. You buy 64 pencils from the store. You bought 64 out of the 100 pencils.(64/100)...or you could also say you bought 64% of the pencils.
64% is the same thing as
$${\frac{{\mathtt{64}}}{{\mathtt{100}}}}$$
By dividing the top and bottom by 4, this can be reduced to
$${\frac{{\mathtt{16}}}{{\mathtt{25}}}}$$
If it helps you, think of this as a word problem.
A store has 100 pencils in stock. You buy 64 pencils from the store. You bought 64 out of the 100 pencils.(64/100)...or you could also say you bought 64% of the pencils.