To find a percentage of a whole number, we will multiply the percentage by the whole number.

So, 

 of 

can be written as

Now, we will write 20% as a fraction.  We know that percentages can be written as the number over 100.  So,

Now, we will write 80 as a fraction.  We know that whole numbers can be written as the number over 1.  So,

Now, we can simplify before multiplying to make things easier.  The zero in 20 can cancel a zero in 100. So,

The zero in 10 can cancel the zero in 80.  So,

Now, we can multiply straight across.  We get

Therefore,  of  is .

To find a percentage of a whole number, we will multiply the percentage by the whole number. 

So, in the problem

 of 

we can write it as

Now, we can write  as a fraction.  We know that percentages can be written as fractions over 100.  So, we get

Now, we will write  as a fraction.  We know that whole numbers can be written as fractions over 1.  So, we get

Now, before we multiply, we can simplify to make things easier.  The zeros in 100 can cancel the zeros in 500.  So, we get

Now, we can multiply straight across.  We get

Therefore,  of  is .

To find a percentage of a whole number, we will multiply the percentage by the whole number.  So, in the problem

 of 

we can re-write it like

Now, we can multiply.  First, we will write the percentage as a fraction.  We know that percentages can be written as fractions over 100.  So, we get

Now, we will write 250 as a fraction.  We know that whole numbers can be written as fractions over 1.  So, we get

Now, before we multiply, we will simplify to make things easier. The zero in 30 and the zero in 100 can cancel.  So, we get

Now, the zero in 10 can cancel the zero in 250.  So, we get

Now, we can multiply straight across.  We get

Therefore,  of   is .

To find a percentage of a whole number, we will multiply the percentage by the whole number. 

So, given the problem

 of 

we can re-write it as

Now, to multiply, we will write both numbers as fractions.  So, to write  as a fraction, we know percentages can be written as fractions over 100.  So, we get

Now, to write  as a fraction, we know whole numbers can be written as fractions over 1.  So, we get

Now, before we multiply, we will simplify to make things easier.  The zero in  can cancel a zero in . So, we get

Now, the zero in  can cancel the zero in .  So, we get

Now, we can multiply straight across.  We get

Therefore,   of  is .

To find a percentage of a whole number, we will multiply the percentage by the whole number.  So, in the problem

 of 

we can write 

Now, we will write  as a fraction.  We know that percentages can be written as fractions over 100.  So, we get

Now, we will write  as a fraction.  We know that whole numbers can be written as fractions over 1.  So, we get

Now, before we multiply, we will simplify to make things easier.  The zero in 10 can cancel a zero in 100.  So, we get

The zero in 10 can cancel the zero in 90.  So, we get

Now, we can multiply straight across.  We get

Therefore,  of  is .

To find a percentage of a whole number, we will multiply the percentage by the whole number.  So, in the problem

 of 

we can re-write it like this

Now, to multiply, we will first write  as a fraction.  We know that percentages can be written as fractions over 100.  So, we can write

Now, we will write  as a fraction.  We know that whole numbers can be written as fractions over 1.  So, we get

Now, we can simplify before we multiply to make things easier.  The zeros in 100 can cancel the zeros in 200.  So, we get

Now, we can multiply straight across.  We get

Therefore,   of  is .

To find a percentage of a whole number, we will multiply the percentage by the whole number.  

So, 

 of 

can be written as 

Now, we will write  as a fraction.  We know that percentages can be written as fractions over 100.  So, we get

Now, we will write  as a fraction.  We know that whole numbers can be written as fractions over 1.  So, we get

Now, we will simplify before we multiply to make things easier.  The zero in 70 can cancel a zero in 100.  So, we get

Now, the zero in 10 can cancel the zero in 150.  So, we get

Now, we can multiply straight across.  We get

Therefore,  of  is .

To find a percentage of a whole number, we will multiply the percentage by the whole number. 

So, in the problem

 of 

we can re-write it as

Now, to multiply, we will write 25% as a fraction.  We know percentages can be written as fractions over 100.  So, we get

Now, we will write 300 as a fraction.  We know whole numbers can be written as fractions over 1.  So, we get

Now, before we multiply, we can simplify to make things easier.  The zeros in 100 can cancel the zeros in 300.  So, we get

Now, we can multiply straight across.  We get

Therefore,   of  is .

To find a percentage of a whole number, we will multiply the percentage by the whole number.  So,

 of 

can be written as

Now, to multiply, we will write  as a fraction. We know that percentages can be written as fractions over 100.  So,

Now, we will write  as a fraction.  We know that whole numbers can be written as fractions over 1.  So,

Now, before we multiply, we will simplify to make things easier.  The zeros in 100 can cancel the zeros in 400.  So,

Now, we can multiply straight across.  We get

Therefore,  of  is .

To find a percentage of a whole number, we will multiply the percentage by the whole number.

So, given the problem

 of 

We can re-write it as

Now, we will write 80% as a fraction.  We know that percentages can be written as fractions over 100.  So, we get

Now, we will write 250 as a fraction.  We know that whole numbers can be written as fractions over 1.  So, we get

Now, we will simplify before we multiply to make things easier.  The zero in 80 can cancel a zero in 100.  So, we get

 The zero in 10 can cancel the zero in 250.  We get

Now, we can multiply straight across.  We get

Therefore,  of  is .