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Basic Arithmetic : Percents and Decimals

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Example Questions

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Example Question #1 : Solving Linear Equations With Part, Percent, And Whole

When an unknown number is increased by $10\%$ , it becomes the number . What is the unknown number?

Possible Answers:

100

Correct answer:

Explanation:

First, convert the percent into a decimal.

$10\%=0.1$

Now, increasing an unknown number by $10\%$ can be written by the following expression:

x+0.1x

Next, set that equal to 88, since that is what the question tells us to do.

x+0.1x=88

Now solve.

1.1x=88

x=80

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Example Question #1 : Solving Linear Equations With Part, Percent, And Whole

$3\%$ of an unknown number is . What is the unknown number?

Possible Answers:

1.08

3600

1200

Correct answer:

1200

Explanation:

Before we can write an equation, we need to turn the percent into a decimal.

$3\%=0.03$

Now, we can write the following equation:

0.03x=36

Divide both sides by 0.03 .

x=1200

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Example Question #1 : Solving Linear Equations With Part, Percent, And Whole

If $10\%$ of an unknown number is , what is the unknown number?

Possible Answers:

3.6

360

Correct answer:

360

Explanation:

First, let stand for the unknown number.

Then, let's convert the percentage $10\%$ into an equivalent decimal (0.10)

Translating the question above into an equation, we have:

0.10n=36

Dividing both sides by 0.10 , we see that n=360 .

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Example Question #1 : Solving Linear Equations With Part, Percent, And Whole

If $20\%$ of a number is , what is the value of ?

Possible Answers:

3.6

200

Correct answer:

200

Explanation:

First, let's convert the percentage $20\%$ into its equivalent decimal 0.20 .

Then, translate the above question into an equation:

0.20z=40

Dividing by 0.20 :

z=200

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Example Question #1 : Changing A Decimal To A Percent

Convert 3.15 to a percent.

Possible Answers:

$31.5\%$

$3.15\%$

$0.315\%$

$315\%$

Correct answer:

$315\%$

Explanation:

To convert a decimal into percent, multiply the decimal by 100 and then add a "%" sign.

$3.15\times100=315$

Add a % sign.

$315\%$

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Example Question #21 : Percents And Decimals

What is 0.49 as a percent?

Possible Answers:

$4.9\%$

$0.49\%$

$49\%$

$490\%$

Correct answer:

$49\%$

Explanation:

To change a demical to a percent, multiply the decimal by 100 and then add the percent sign.

$0.49\times100 = 49$

Add the percent sign.

$49\rightarrow49\%$

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Example Question #22 : Percents And Decimals

What is 0.87 as a percent?

Possible Answers:

$87\%$

$8.7\%$

$870\%$

$0.87\%$

Correct answer:

$87\%$

Explanation:

To change a decimal into a percent, start by multiplying the decimal by 100.

$0.87\times100=87$

Then, add a percent sign to the end of that number.

$87\rightarrow87\%$

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Example Question #23 : Percents And Decimals

What is 0.71 as a percent?

Possible Answers:

$0.71\%$

$71\%$

$710\%$

$7.1\%$

Correct answer:

$71\%$

Explanation:

To change a decimal into a percent, start by multiplying the decimal by 100.

$0.71\times100=71$

Then add a percent sign to the end of the number.

$71\rightarrow71\%$

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Example Question #24 : Percents And Decimals

What is 0.54 as a percent?

Possible Answers:

$5.4\%$

$540\%$

$0.54\%$

$54\%$

Correct answer:

$54\%$

Explanation:

To change a decimal into a percent, multiply the decimal by 100 then add the percent sign.

$0.54\times100=54$

$54\rightarrow 54\%$

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Example Question #25 : Percents And Decimals

Change 0.99 into a percent.

Possible Answers:

$990\%$

$99\%$

$0.99\%$

$9.9\%$

Correct answer:

$99\%$

Explanation:

To change a decimal into a percent, multiply the decimal by 100 then add a percent sign at the end of that number.

$0.99\times100=99$

$99\rightarrow99\%$

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Basic Arithmetic : Percents and Decimals

Study concepts, example questions & explanations for Basic Arithmetic

All Basic Arithmetic Resources

Example Questions

Example Question #1 : Solving Linear Equations With Part, Percent, And Whole

Example Question #1 : Solving Linear Equations With Part, Percent, And Whole

Example Question #1 : Solving Linear Equations With Part, Percent, And Whole

Example Question #1 : Solving Linear Equations With Part, Percent, And Whole

Example Question #1 : Changing A Decimal To A Percent

Example Question #21 : Percents And Decimals

Example Question #22 : Percents And Decimals

Example Question #23 : Percents And Decimals

Example Question #24 : Percents And Decimals

Example Question #25 : Percents And Decimals

All Basic Arithmetic Resources

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