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Pre-Algebra : One-Step Equations

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Example Questions

Example Question #81 : One Step Equations

Solve for .

4z=10

Possible Answers:

$z=\frac{5}{2}$

z=40

$z=\frac{5}{4}$

z=0

$z=\frac{10}{2}$

Correct answer:

$z=\frac{5}{2}$

Explanation:

To get z by itself, you must divide both sides of the equation by 4

$\frac{4z}{4}=\frac{10}{4}$

which simplifies to

$z=\frac{10}{4}=\frac{5}{2}$

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Example Question #82 : One Step Equations

Solve this equation: $x-\frac{5}{2}=\frac{3}{4}$

Possible Answers:

$x=-\frac{7}{4}$

$x=\frac{4}{3}$

$x=\frac{13}{4}$

$x=\frac{3}{4}$

$x=-\frac{4}{3}$

Correct answer:

$x=\frac{13}{4}$

Explanation:

$x-\frac{5}{2}=\frac{3}{4}$

Isolate x:

$x=\frac{3}{4}+\frac{5}{2}$

Find a common denominator:

$x=\frac{3}{4}+\frac{5}{2}*\frac{2}{2}\rightarrow x=\frac{3}{4}+\frac{10}{4}=\frac{13}{4}$

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Example Question #22 : One Step Equations With Fractions

Solve for :

$\frac{18}{2}x=81$

Possible Answers:

x=5

x=10

x=2.25

x=4.5

x=9

Correct answer:

x=9

Explanation:

Normally when we have a fraction we multiply by the reciprocal to get the fractions to equate to 1. Consider this fraction and its reciprocal $\frac{5}{2}*\frac{2}{5}=1$ . But since our fraction can be reduced to a whole number we can just divide both sides by that number.

$\frac{18}{2}x=81$

Reduce the fraction:

9x=81

Isolate x by dividing both sides by nine:

x=9

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Example Question #23 : One Step Equations With Fractions

Solve: $\frac{2}{3}x=2$

Possible Answers:

$\frac{3}{2}$

$\frac{4}{3}$

$\frac{1}{3}$

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.

Multiply both sides by the reciprocal of the coefficient in front of the in order to isolate the variable.

$\frac{2}{3}x\times \frac{3}{2}=2\times \frac{3}{2}$

x=3

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Example Question #24 : One Step Equations With Fractions

Solve: $9x = \frac{1}{9}$

Possible Answers:

$\frac{1}{18}$

$\frac{1}{9}$

$\frac{1}{81 }$

Correct answer:

$\frac{1}{81 }$

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 by nine on both sides to isolate the variable.

$\frac{9x }{9}= \frac{\frac{1}{9}}{9}$

$x=\frac{1}{9}\times\frac{1}{9}=\frac{1}{81}$

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Example Question #25 : One Step Equations With Fractions

Solve:

$\frac{6}{10}+x = \frac{1}{10}$

Possible Answers:

$-\frac{1}{2}$

$\frac{2}{3}$

$-\frac{1}{4}$

Correct answer:

$-\frac{1}{2}$

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 unknown variable, subtract $\frac{6}{10}$ from both sides.

$\frac{6}{10}+x -\left(\frac{6}{10}\right)= \frac{1}{10}-\left(\frac{6}{10}\right)$

$x=-\frac{5}{10} =-\frac{1}{2}$

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Example Question #26 : One Step Equations With Fractions

Solve: $\frac{1}{500}x = \frac{1}{5}$

Possible Answers:

$\frac{1}{100}$

1000

100

$\frac{1}{1000}$

Correct answer:

100

Explanation:

In order to solve for x, multiply both sides of the equation by the reciprocal of the coefficient in front of the unknown variable.

When multiplying fractions, multiply the numerators together and multiply the denominators together. After multiplication is done, find common factors in the numerator and denominator to cancel out and completely simplify the fraction.

$\\\frac{1}{500}x \times 500\\\\= \frac{1}{5}\times 500\\\\=\frac{500}{5}\\\\=\frac{5\cdot 100}{5}$

x=100

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Example Question #27 : One Step Equations With Fractions

Solve for :

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

Possible Answers:

$\frac{2}{3}$

$\frac{4}{9}$

$\frac{9}{4}$

$\frac{3}{2}$

Correct answer:

$\frac{9}{4}$

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 the unknown variable in this particular case, isolate by multiplying both sides by the reciprocal of the fraction coefficient in front of the .

$\frac{2}{3}x \times \frac{3}{2}= \frac{3}{2} \times \frac{3}{2}$

$x=\frac{9}{4}$

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Example Question #81 : One Step Equations

Evaluate: $\frac{x}{3} = 27$

Possible Answers:

$\frac{1}{9}$

$\frac{1}{81 }$

Correct answer:

Explanation:

In order to isolate the variable, multiply three on both sides of the equation.

$\frac{x}{3} \times3 = 27 \times 3$

x=81

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Example Question #29 : One Step Equations With Fractions

Solve: $\frac{3}{4} +x = \frac{5}{4}$

Possible Answers:

$\frac{1}{2}$

$-\frac{1}{2}$

$\frac{2}{3}$

Correct answer:

$\frac{1}{2}$

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 $\frac{3}{4}$ from both sides of the equation.

$x = \frac{5}{4}-\frac{3}{4} = \frac{2}{4}$

Reduce the fraction.

$x= \frac{1}{2}$

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Pre-Algebra : One-Step Equations

Study concepts, example questions & explanations for Pre-Algebra

All Pre-Algebra Resources

Example Questions

Example Question #81 : One Step Equations

Example Question #82 : One Step Equations

Example Question #22 : One Step Equations With Fractions

Example Question #23 : One Step Equations With Fractions

Example Question #24 : One Step Equations With Fractions

Example Question #25 : One Step Equations With Fractions

Example Question #26 : One Step Equations With Fractions

Example Question #27 : One Step Equations With Fractions

Example Question #81 : One Step Equations

Example Question #29 : One Step Equations With Fractions

All Pre-Algebra Resources

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