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Pre-Algebra : Pre-Algebra

Study concepts, example questions & explanations for Pre-Algebra

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11 Diagnostic Tests 177 Practice Tests Question of the Day Flashcards Learn by Concept

Example Questions

Example Question #901 : Pre Algebra

Solve: 0.15x = 15

Possible Answers:

2.25

2500

225

100

Correct answer:

100

Explanation:

Divide 0.15 on both sides of the equation.

$\frac{0.15x}{0.15} = \frac{15}{0.15}$

x=100

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Example Question #343 : Algebraic Equations

Solve: 0.04x = 0.8

Possible Answers:

0.02

200

0.2

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 0.04 .

$\frac{0.04x }{0.04}= \frac{0.8}{0.04}$

$\frac{0.8}{0.04} = \frac{80}{4}$

x=20

If dividing by decimals is difficult, just multiply both decimals by 100 to get integers.

$\frac{0.8\times 100}{0.04\times100} = \frac{80}{4}$

When you multiply by 100 you move the decimal two spaces to the right.

From here factor the numerator and cancel like terms.

$\frac{80}{4}=\frac{20\cdot 4}{4}=20$

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Example Question #46 : One Step Equations With Decimals

Solve: 0.3 + x = 0.03

Possible Answers:

2.7

-2.7

-2.07

2.07

-0.27

Correct answer:

-0.27

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.

Subtract 0.3 from both sides to isolate the .

0.3 + x -0.3= 0.03-0.3

Add a placeholder if necessary.

x= 0.03 - 0.30 = -0.27

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Example Question #902 : Pre Algebra

Solve: 0.35 = 0.02+x

Possible Answers:

0.37

3.7

0.15

0.33

0.55

Correct answer:

0.33

Explanation:

To isolate the unknown variable, subtract 0.02 on both sides of the equation.

0.35- 0.02= 0.02+x- 0.02

x=0.33

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Example Question #48 : One Step Equations With Decimals

Solve for : 0.2x = 0.3

Possible Answers:

$\frac{3}{2}$

0.6

$\frac{1}{10}$

Correct answer:

$\frac{3}{2}$

Explanation:

Isolate the variable by dividing both sides by 0.2 .

$\frac{0.2}{0.2}x = \frac{0.3}{0.2}$

The fraction can be solved by moving the decimal on both the denominator and numerator one unit to the right.

The answer is: $\frac{3}{2}$

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Example Question #49 : One Step Equations With Decimals

Solve and express the answer as a fraction: 0.9x = 8

Possible Answers:

$\frac{80}{9}$

$\frac{8}{90}$

$\frac{9}{80}$

$\frac{36}{5}$

$\frac{18}{25}$

Correct answer:

$\frac{80}{9}$

Explanation:

To solve for the unknown variable, divide both sides by 0.9 .

$\frac{0.9x}{0.9} = \frac{8}{0.9}$

Converting 0.9 to a fraction will become $\frac{9}{10}$ .

When eight divides by this fraction, it is similar to multiplying its reciprocal.

$\frac{8}{0.9} = 8\times \frac{10}{9} = \frac{80}{9}$

The answer is: $\frac{80}{9}$

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Example Question #903 : Pre Algebra

Solve: 1.25x = 5

Possible Answers:

6.25

3.25

Correct answer:

Explanation:

Divide 1.25 on both sides of the equation to isolate the unknown variable.

$\frac{1.25x}{1.25} = \frac{5}{1.25}$

x=4

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Example Question #904 : Pre Algebra

Solve: 0.1x = 1000

Possible Answers:

1000.1

999.9

10000

100

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 #342 : Algebraic Equations

Solve: 0.003x = 3.3

Possible Answers:

1010

1000

100

1100

1001

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 #905 : Pre Algebra

Solve: 0.6x = 24

Possible Answers:

$\frac{1}{4}$

0.04

400

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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Pre-Algebra : Pre-Algebra

Study concepts, example questions & explanations for Pre-Algebra

All Pre-Algebra Resources

Example Questions

Example Question #901 : Pre Algebra

Example Question #343 : Algebraic Equations

Example Question #46 : One Step Equations With Decimals

Example Question #902 : Pre Algebra

Example Question #48 : One Step Equations With Decimals

Example Question #49 : One Step Equations With Decimals

Example Question #903 : Pre Algebra

Example Question #904 : Pre Algebra

Example Question #342 : Algebraic Equations

Example Question #905 : Pre Algebra

All Pre-Algebra Resources

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