GRE Math : How to add decimals

Study concepts, example questions & explanations for GRE Math

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Example Questions

Example Question #2 : Decimals

Solve for :

Possible Answers:

Correct answer:

Explanation:

To add decimals, simply treat them like you would any other number.  Any time two of the digits in a particular place (i.e. tenths, hundredths, thousandths) add up to more than ten, you have to carry the one to the next greatest column.  Therefore:

So .

Example Question #1 : How To Add Decimals

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve this problem, subtract  from both sides of the eqution, 

Therefore, .

If you're having trouble subtracting the decimal, mutliply both numbers by  followed by a number of zeroes equal to the number of decimal places.  Then subtract, then divide both numbers by the number you multiplied them by. 

Example Question #2 : How To Add Decimals

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve, first add  to both sides of the equation:

Then add the decimals together:

Example Question #5 : Decimals

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve, you need to do some algebra:

Isolate x by adding the 4.150 to both sides of the equation.

Then add the decimals.  If you have trouble adding decimals, an effective method is to place one decimal over the other, and add the digits one at a time.  Remember to carry every time the digits in a given place add up to more than .

Example Question #6 : Decimals

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve for , first add  to both sides of the equation, so that you isolate the variable: 

Then, add your decimals, and remember that .

Example Question #7 : Decimals

Solve for :

Possible Answers:

Correct answer:

Explanation:

To solve, first add  to both sides of your equation, so you isolate the variable:

Then add the decimals together:

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