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Pre-Algebra : One-Step Equations with Decimals

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Example Questions

Example Question #51 : One Step Equations With Decimals

Solve: 0.1x = 1000

Possible Answers:

100

999.9

10000

1000.1

Correct answer:

10000

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

Divide both sides by 0.1 to isolate the variable.

$\frac{0.1x }{0.1}= \frac{1000}{0.1}$

Decimals may be written as fractions.

$0.1=\frac{1}{10}$

Dividing by a fraction is the same as multiplying by its reciprocal:

$\frac{1000}{1}\times \frac{10}{1}$

Therefore,

x=10000 .

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Example Question #347 : Algebraic Equations

Solve: 0.003x = 3.3

Possible Answers:

1100

1010

1001

100

1000

Correct answer:

1100

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

Divide 0.003 on both sides to isolate the unknown variable.

$\frac{0.003x}{0.003} = \frac{3.3}{0.003}$

Decimals may be written as fractions.

$0.003=\frac{3}{1000}$

Dividing by a fraction is the same as multiplying by its reciprocal:

$3.3\times \frac{1000}{3}$

x= 1100

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Example Question #52 : One Step Equations With Decimals

Solve: 0.6x = 24

Possible Answers:

400

$\frac{1}{4}$

0.04

Correct answer:

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

To solve for , divide both sides by 0.6

$\frac{0.6x }{0.6}= \frac{24}{0.6}$

Decimals may be written as fractions.

$0.6=\frac{6}{10}$

Dividing by a fraction is the same as multiplying by its reciprocal:

Substitute and solve.

$x=\frac{24}{1}\times\frac{10}{6}$

$x=\frac{240}{6}=\frac{6\cdot 40}{6}$

The six in the numerator and in the denominator cancel out and we are left with the final answer,

x=40 .

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Example Question #53 : One Step Equations With Decimals

Solve: 0.123+x = 456

Possible Answers:

0.333

455.877

3.33

333

0.455877

Correct answer:

455.877

Explanation:

In order to solve for , subtract 0.123 from both sides.

0.123+x -0.123= 456-0.123

x=455.877

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Example Question #52 : One Step Equations With Decimals

Evaluate:

0.09x = 27

Possible Answers:

26.91

300

27.09

3000

Correct answer:

300

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

Solve by dividing 0.09 on both sides of the equation. Move the decimal two places to the right.

$\frac{0.09x}{0.09} = \frac{27}{0.09} =\frac{2700}{9}$

Now factor the numerator to find values that can cancel out.

$\frac{2700}{9}=\frac{9\cdot 300}{9}$

The nine in the numerator and denominator reduce to one and we are left with our final answer,

x=300 .

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Example Question #54 : One Step Equations With Decimals

Solve: 0.39x = 7.8

Possible Answers:

0.741

200

7.41

Correct answer:

Explanation:

Divide 0.39 on both sides of the equation.

$\frac{0.39x}{0.39} = \frac{7.8}{0.39}$

x=20

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Example Question #57 : One Step Equations With Decimals

Solve:

2.02x= -0.202

Possible Answers:

0.1

-0.01

-0.1

Correct answer:

-0.1

Explanation:

Divide by 2.02 on both sides of the equation.

$\frac{2.02x}{2.02}=\frac{ -0.202}{2.02}$

Decimals may be written as fractions.

$-0.202=-\frac{202}{1000}; 2.02=\frac{202}{100}$

Dividing by a fraction is the same as multiplying by its reciprocal:

Substitute and solve.

$x=-\frac{202}{1000}\times\frac{100}{202}$

x=-0.1

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Example Question #58 : One Step Equations With Decimals

Solve: x-0.56 = 1.4

Possible Answers:

1.6

1.16

1.96

1.52

0.69

Correct answer:

1.96

Explanation:

Add 0.56 on both sides of the equation.

x-0.56 +0.56= 1.4+0.56

x= 1.40+0.56

x= 1.96

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Example Question #59 : One Step Equations With Decimals

Solve: 0.6x = 36

Possible Answers:

216

Correct answer:

Explanation:

In order to solve the equation, we have to isolate the variable. We do this by performing the same operation to either side of the equation.

To isolate the variable, divide both sides by 0.6 .

$\frac{0.6x}{0.6} = \frac{36}{0.6}$

Decimals may be written as fractions.

$0.6=\frac{6}{10}$

Dividing by a fraction is the same as multiplying by its reciprocal:

$\frac{36}{1}\times \frac{10}{6}=\frac{360}{6}$

Now factor the numerator to find like terms that can reduce.

$\frac{360}{6}=\frac{60\cdot 6}{6}$

The six in the numerator and denominator reduce to one and the final solution becomes,

x=60 .

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Example Question #352 : Algebraic Equations

Solve: 2x = 0.003

Possible Answers:

0.15

0.0015

0.06

0.015

0.006

Correct answer:

0.0015

Explanation:

Solve by dividing both sides by 2.

$\frac{2x}{2} = \frac{0.003}{2}$

The fraction on the right side of the equation can be rewritten as:

$x= \frac{0.003}{2} = \frac{\frac{3}{1000}}{2}$

Dividing by two is also similar to multiplying by one half.

$x= \frac{3}{1000} \times \frac{1}{2}= \frac{3}{2000}$

x=0.0015

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Pre-Algebra : One-Step Equations with Decimals

Study concepts, example questions & explanations for Pre-Algebra

All Pre-Algebra Resources

Example Questions

Example Question #51 : One Step Equations With Decimals

Example Question #347 : Algebraic Equations

Example Question #52 : One Step Equations With Decimals

Example Question #53 : One Step Equations With Decimals

Example Question #52 : One Step Equations With Decimals

Example Question #54 : One Step Equations With Decimals

Example Question #57 : One Step Equations With Decimals

Example Question #58 : One Step Equations With Decimals

Example Question #59 : One Step Equations With Decimals

Example Question #352 : Algebraic Equations

All Pre-Algebra Resources

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