ISEE Middle Level Math : How to find the part from the whole with percentage

Study concepts, example questions & explanations for ISEE Middle Level Math

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Example Questions

Example Question #895 : Numbers And Operations

What is  of  ?

Possible Answers:

Correct answer:

Explanation:

 of   can be rewritten as 

Example Question #41 : How To Find The Part From The Whole With Percentage

What is 1,800% of 0.00018?

Possible Answers:

Correct answer:

Explanation:

1,800% of 0.00018 is equal to

.

Example Question #42 : How To Find The Part From The Whole With Percentage

What is 1.11% percent of 1.11?

Possible Answers:

Correct answer:

Explanation:

Taking 1.11% percent of a number is the same as multiplying it by 0.0111, so

1.11% percent of 1.11 is equal to

.

Example Question #43 : How To Find The Part From The Whole With Percentage

If  is  of , what is the value of ?

Possible Answers:

Correct answer:

Explanation:

If  is  of , that means that . When we plug 1 into , the result is .

Example Question #44 : How To Find The Part From The Whole With Percentage

King Middle School has 320 students enrolled in the 7th grade.  Sixty percent of the 7th graders at King are girls.  How many 7th grade girls are enrolled at King Middle School?

Possible Answers:

Correct answer:

Explanation:

When given the quantity of the whole, you can determine a part using a percentage by converting the percentage to a decimal and multiplying the whole by that decimal.  

Example Question #45 : How To Find The Part From The Whole With Percentage

What is 60% of 300?

Possible Answers:

Correct answer:

Explanation:

Substitute in the proportion:

 

 

Cross multiply:

Example Question #46 : How To Find The Part From The Whole With Percentage

What number is 85% of 560?

Possible Answers:

Correct answer:

Explanation:

To determine the number that is 85% of 560, convert the percentage to a decimal:

Then multiply:

The correct answer is 

Example Question #47 : How To Find The Part From The Whole With Percentage

What is  of  ? 

Possible Answers:

Correct answer:

Explanation:

To find a percentage of a whole, we will first write the percentage as a fraction.  We know that all percentages can be written as a number over 100.  So,

Now, we will multiply the fraction by the whole number.  We get

Now, we can simplify/multiply.  

 

We write 150 as a fraction over 1.

We can cancel out the zero in 150 and the zero in 100.  

We can cancel out the zero in 30 and the zero in 10.

Now, we can multiply.  

 

Therefore,  of  is .

 

Example Question #604 : Concepts

What is the sale price of a product that costs  if the sale is  off the original price?

Possible Answers:

Correct answer:

Explanation:

First, find  of :

Then, subtract this value from the whole:

Example Question #234 : Percentage

What is  of ?

Possible Answers:

Correct answer:

Explanation:

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

 of 

can be written as

We know that a percentage can be written as a fraction over 100.  So, 

Now, we can solve.  

We can cancel out the zero in 30 and the zero in 100.

We can cancel out the zero in 10 and the zero in 270.

Now, we multiply.

 

Therefore,  of  is .

 

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