GRE Math : How to add decimals

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Example Questions

Example Question #3 : Decimals

Solve for :

n = 0.867 + 3.244

Possible Answers:

n = 4.222

n = 4.121

n = 4.321

n = 4.123

n = 4.111

Correct answer:

n = 4.111

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:

.867 +3.244 = 4.111

So n = 4.111 .

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Example Question #1 : Decimals

Solve for :

y + 0.459 = 1.234

Possible Answers:

y = 0.765

y = 0.777

y = 0.785

y = 0.875

y = 0.775

Correct answer:

y = 0.775

Explanation:

To solve this problem, subtract 0.459 from both sides of the eqution, 1.234 - 0.459 = 0.775

Therefore, y = 0.775 .

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.

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Example Question #2 : Decimal Operations

Solve for :

n - 9.85 = 10.75

Possible Answers:

n = 20.620

n = 20.6

n = 21

n = 20

n = 21.6

Correct answer:

n = 20.6

Explanation:

To solve, first add 9.85 to both sides of the equation:

n - 9.85 + 9.85 = 10.75 + 9.85

n = 10.75 + 9.85

Then add the decimals together:

n = 20.6

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Example Question #361 : Arithmetic

Solve for :

x - 4.150 = 2.818

Possible Answers:

x = 7.968

x = 6.888

x = 5.968

x = 7

x = 6.968

Correct answer:

x = 6.968

Explanation:

To solve, you need to do some algebra:

x - 4.150 = 2.818

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

x - 4.150 +4.150 = 2.818 + 4.150

x = 2.818 + 4.150

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 .

x = 6.968

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Example Question #5 : Decimals

Solve for :

y - 1.2 = 3.865

Possible Answers:

y = 6

y = 5.865

y = 5

y = 5.065

y = 6.065

Correct answer:

y = 5.065

Explanation:

To solve for , first add 1.2 to both sides of the equation, so that you isolate the variable:

y - 1.2 + 1.2 = 3.865 + 1.2

y = 3.865 + 1.2

Then, add your decimals, and remember that 1.2 = 1.200 .

y = 5.065

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Example Question #1 : Decimal Operations

Solve for :

p - 3.222 = 4.008

Possible Answers:

p = 7.232

p = 7.23

p = 7.222

p=7.323

p = 7.32

Correct answer:

p = 7.23

Explanation:

To solve, first add 3.222 to both sides of your equation, so you isolate the variable:

p - 3.222 + 3.222 = 4.008 + 3.222

p = 4.008 + 3.222

Then add the decimals together:

p = 7.23

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GRE Math : How to add decimals

Study concepts, example questions & explanations for GRE Math

All GRE Math Resources

Example Questions

Example Question #3 : Decimals

Example Question #1 : Decimals

Example Question #2 : Decimal Operations

Example Question #361 : Arithmetic

Example Question #5 : Decimals

Example Question #1 : Decimal Operations

All GRE Math Resources

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