GED Math : Numbers and Operations

Study concepts, example questions & explanations for GED Math

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Example Questions

Example Question #81 : Complex Operations

What is 90% of 750?

Possible Answers:

Correct answer:

Explanation:

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

So, we get

To simplify, we can cancel. The zeros will cancel each other out. We get

Therefore, 90% of 750 is 675.

Example Question #81 : Complex Operations

Solve the proportion:  

Possible Answers:

Correct answer:

Explanation:

Cross multiply the terms.

Divide by six on both sides.

The answer is:  

Example Question #82 : Complex Operations

Solve the proportion:  

Possible Answers:

Correct answer:

Explanation:

Cross multiply the terms.

Distribute the terms.

Subtract  on both sides.

Divide or multiply by negative one to isolate the x-variable.

The answer is:   

Example Question #83 : Complex Operations

Solve the proportion:  

Possible Answers:

Correct answer:

Explanation:

Cross multiply the terms.

Divide by 24 on both sides.

Reduce the fractions.

The answer is:  

Example Question #411 : Numbers And Operations

Solve the proportion:  

Possible Answers:

Correct answer:

Explanation:

To solve for the unknown variable, we will need to cross multiply both sides.

Divide by 19 on both sides.

The answer is:  

Example Question #412 : Numbers And Operations

What percent of 60 is 5?

Possible Answers:

Correct answer:

Explanation:

Set up an equation such that some number out of 100 times 60 is equal to 5.

Multiply both sides by .

The answer is:  

Example Question #53 : Proportions And Percentages

What is  of ?

Possible Answers:

Correct answer:

Explanation:

For percentage problems, the following is the easiest way to get to the correct answer.  Always convert the following:

"is": 

"of": 

For your problem, it is very easy, for you are merely looking for  of .  Remember that  is .  Therefore, your answer is merely:

Example Question #54 : Proportions And Percentages

What is  of  of  of ?  Round to the nearest hundredth.

Possible Answers:

Correct answer:

Explanation:

For percentage problems, the following is the easiest way to get to the correct answer.  Always convert the following:

"is": 

"of": 

For your problem, it is relatively easy.  First convert your percentages into the following decimal values:

Therefore, your answer is merely:

Round this to 

Example Question #86 : Complex Operations

What is 10% of 140 ? 

Possible Answers:

Correct answer:

Explanation:

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

Now, the zero in the 10 and the 100 can cancel. We get

The zero in 10 and in 140 can cancel. We get

Now, we can multiply.

Therefore, 10% of 140 is 14.

Example Question #87 : Complex Operations

Solve the proportion:  

Possible Answers:

Correct answer:

Explanation:

Cross multiply to solve.

Subtract  from both sides.

Divide by 7 on both sides.

The answer is:  

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