To find a percentage of a whole, 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 a percentage is that number over 100.  So, we can write  as

Now, we will write  as a fraction.  We get

Now, to make multiplication easier, we will simplify.  To simplify, we can cancel out the zero in 10 and a zero in 100.  So,

We can continue to simplify.  We can cancel the zero in 10 and the zero in 70.  We get

Now, we can multiply straight across.  We get

Therefore,  of  is .

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

So, in the problem

 of 

we can write it as

Now, to multiply, we need to write  as a fraction.  A percentage can be rewritten as the number over 100.  So, we get

Now, we need to write  as a fraction.  Any whole number can be written as a fraction by simply writing it over 1.  So, we get

Before we multiply, we can simplify the fractions to make things easier.  The zero in 20 can cancel a zero in 100.  We get

The zero in 10 can cancel the zero in 50.  We get

Now, we can multiply.  To multiply fractions, we will multiply straight across.  We get

Therefore,  of  is .

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

So, given the problem 

 of 

we can write it as

To multiply a percentage, we will re-write the percentage as a fraction.  We know that percentages can be written as that number over 100.  So, we get

Now, we will write 40 as a fraction.  We know that whole numbers can be written as that number over 1.  So, we get

Now, before we multiply, we will simplify to make things easier.  The zero in 10 and a zero in 100 can be cancelled.  We get

The zero in 10 can be cancelled with the zero in 40.  We get

Now, we will multiply straight across. 

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 will write the percentage as a fraction.  To do that, we write the number over 100.  So,

To multiply, we also need to write 30 as a fraction.  To do that, we write the whole number over 1.  So,

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

Now, we will 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 will write 70% as a fraction.  We know that a percentage can be written as the number over 100.  So, we get

Now, we will write 150 as a fraction.  To write a whole number as a fraction, we will write the number over 1.  We get

Now, before we multiply, we can simplify to make things easier.  

The zero in 70 can cancel a zero in 100.  So,

The zero in 10 can cancel the zero in 150.  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, 

 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 .