GRE Math : How to subtract decimals

Study concepts, example questions & explanations for GRE Math

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Example Questions

Example Question #7 : Decimals

Quantity A:

Quantity B:

 

Possible Answers:

Quantity B is greater.

The relationship cannot be determined.

The two quantities are equal.

Quantity A is greater.

Correct answer:

The relationship cannot be determined.

Explanation:

Use the values of .5 and 2 as possible x values. If x = 2, Quantity A is positive and greater, but if x = .5, Quantity A is negative and therefore smaller. As such, the relationship cannot be determined.

Example Question #1 : Decimal Operations

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve for , subtract  from both sides of the equation.  , therefore, .

If you have trouble subtracting the decimals, you can multiply both of them by  to get whole numbers, then subtract as normal, then divide your result by 

Example Question #1 : How To Subtract Decimals

Possible Answers:

Correct answer:

Explanation:

Make sure to follow the order of operations. Begin by combining all terms inside the parentheses:

Convert the fraction to a decimal and once again complete the operations inside the parentheses:

The answer is .

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