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Common Core: 8th Grade Math : Grade 8

Study concepts, example questions & explanations for Common Core: 8th Grade Math

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All Common Core: 8th Grade Math Resources

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Example Questions

Example Question #101 : Grade 8

Solve and leave your answer in scientific notation:

$(2\times10^6)\times(4\times10^3)$

Possible Answers:

$6\times10^{18}$

$8\times10^{18}$

$6\times10^9$

$8\times10^9$

Correct answer:

$8\times10^9$

Explanation:

The first step to solving this problem is to combine like terms:

$(2\times4)\times(10^6\times10^3)$

Next, we can solve our two separate multiplication problems starting with the expression on the left:

$2\times4=8$

In order to solve the next expression, we need to recall our exponent rules from a previous lesson:

$10^6\times10^3$

When our base numbers are equal to each other, like in this problem, we can add our exponents together using the following formula:

$a^m\times a^n=a^{(m+n)}$

Let's apply this rule to our problem:

$10^{6}\times 10^{3}=10^{(6+3)}$

$10^6\times10^3=10^9$

The question asked us to leave our answer in scientific notation; thus, $8\times10^9$ is the correct answer.

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Example Question #1411 : Intermediate Geometry

What is the slope of the line that passes through the points (3,4) and (5,13) ?

Possible Answers:

-4/3

2/9

9/2

-9/2

13/4

Correct answer:

9/2

Explanation:

The slope of a line is sometimes referred to as "rise over run." This is because the formula for slope is the change in y-value (rise) divided by the change in x-value (run). Therefore, if you are given two points, $(x_{1},y_{1})$ and $(x_{2},y_{2})$ , the slope of their line can be found using the following formula: $slope=(y_{1}-y_{2})/(x_{1}-x_{2})$

This gives us (13-4)/(5-3)=9/2 .

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Example Question #1 : How To Find The Slope Of A Line

Given points (1,2) and (-1,3) , what is the slope of the line connecting them?

Possible Answers:

$-\frac{1}{4}$

$\frac{1}{2}$

$-\frac{1}{2}$

Correct answer:

$-\frac{1}{2}$

Explanation:

Write the slope formula. Plug in the points and solve.

$m= \frac{y_2-y_1}{x_2-x_1}= \frac{3-2}{-1-1}= -\frac{1}{2}$

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Example Question #2 : How To Find The Slope Of A Line

What is the slope of the line connecting the points $(2,\sqrt2)$ and (1,2) ?

Possible Answers:

$2-\sqrt2$

$-\sqrt2+1$

$-\sqrt2-2$

$\sqrt2 -2$

$-1-\sqrt2$

Correct answer:

$\sqrt2 -2$

Explanation:

Write the slope formula. Plug in the point, and simplify.

$m=\frac{y_2-y_1}{x_2-x_1}= \frac{2-\sqrt2}{1-2}=\frac{2-\sqrt2}{-1}= -(2-\sqrt2) = \sqrt2-2$

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Example Question #2 : How To Find The Slope Of A Line

What is the slope of a line with an -intercept is and another -intercept of ?

Possible Answers:

$\infty$

Correct answer:

Explanation:

The -intercept is the value when y=0 .

Therefore, since the two -intercepts are and , the points are (4,0) and (6,0) .

Write the slope formula, plug in the values, and solve.

$m=\frac{y_2-y_1}{x_2-x_1} = \frac{0-0}{6-4}= \frac{0}{2} =0$

The slope is zero.

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Example Question #2 : How To Find The Slope Of A Line

Given the points (4, 3) and (8, 9) , find the slope of the line.

Possible Answers:

$\frac{4}{3}$

$\frac{-6}{4}$

$\frac{3}{2}$

$\frac{2}{3}$

$\frac{-3}{4}$

Correct answer:

$\frac{3}{2}$

Explanation:

The formula for the slope of a line is $\frac{y_2-y_1}{x_2-x_1}$ .

We then plug in the points given: $\frac{9-3}{8-4}=\frac{6}{4}$ which is then reduced to $\frac{3}{2}$ .

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Example Question #2 : Graph Proportional Relationships, Interpreting The Unit Rate As The Slope: Ccss.Math.Content.8.Ee.B.5

A line crosses the x-axis at (6,8) and the y-axis at (0,6) . What is the slope of this line?

Possible Answers:

None of these.

m=-3

m=3

$m=-\frac{1}{3}$

$m=\frac{1}{3}$

Correct answer:

$m=\frac{1}{3}$

Explanation:

Given the points,

$\\(x_1,y_1)=(0,6) \\(x_2,y_2)=(6,8)$ .

We compute slope (m) as follows:

$m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}=\frac{8-6}{6-0}=\mathbf{\frac{1}{3}}$

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Example Question #3 : How To Find The Slope Of A Line

Find the slope of the line that passes through the points:

(12, 2) and (-12, 4)

Possible Answers:

$-\frac{1}{12}$

$-\frac{3}{4}$

Correct answer:

$-\frac{1}{12}$

Explanation:

Recall that the slope of a line also measures how steep the line is. Use the following equation to find the slope of the line:

$\text{Slope}=\frac{y_2-y_1}{x_2-x_1}$

Now, substitute in the information using the given points.

$\text{Slope}=\frac{4-2}{-12-12}$

Simplify.

$\text{Slope}=\frac{2}{-24}$

Solve.

$\text{Slope}=-\frac{1}{12}$

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Example Question #102 : Grade 8

Find the slope of the line that passes through the points:

(2, 4) and (-10, -20)

Possible Answers:

$\frac{7}{8}$

$-\frac{1}{2}$

Correct answer:

Explanation:

Recall that the slope of a line also measures how steep the line is. Use the following equation to find the slope of the line:

$\text{Slope}=\frac{y_2-y_1}{x_2-x_1}$

Now, substitute in the information using the given points.

$\text{Slope}=\frac{-20-4}{-10-2}$

Simplify.

$\text{Slope}=\frac{-24}{-12}$

Solve.

$\text{Slope}=2$

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Example Question #2 : Graph Proportional Relationships, Interpreting The Unit Rate As The Slope: Ccss.Math.Content.8.Ee.B.5

Find the slope of the line that passes through the points:

(4, 5) and (-3, 1)

Possible Answers:

$\frac{3}{7}$

$\frac{4}{7}$

$\frac{5}{7}$

$-\frac{2}{7}$

Correct answer:

$\frac{4}{7}$

Explanation:

Recall that the slope of a line also measures how steep the line is. Use the following equation to find the slope of the line:

$\text{Slope}=\frac{y_2-y_1}{x_2-x_1}$

Now, substitute in the information using the given points.

$\text{Slope}=\frac{1-5}{-3-4}$

Simplify.

$\text{Slope}=\frac{-4}{-7}$

Solve.

$\text{Slope}=\frac{4}{7}$

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Common Core: 8th Grade Math : Grade 8

Study concepts, example questions & explanations for Common Core: 8th Grade Math

All Common Core: 8th Grade Math Resources

Example Questions

Example Question #101 : Grade 8

Example Question #1411 : Intermediate Geometry

Example Question #1 : How To Find The Slope Of A Line

Example Question #2 : How To Find The Slope Of A Line

Example Question #2 : How To Find The Slope Of A Line

Example Question #2 : How To Find The Slope Of A Line

Example Question #2 : Graph Proportional Relationships, Interpreting The Unit Rate As The Slope: Ccss.Math.Content.8.Ee.B.5

Example Question #3 : How To Find The Slope Of A Line

Example Question #102 : Grade 8

Example Question #2 : Graph Proportional Relationships, Interpreting The Unit Rate As The Slope: Ccss.Math.Content.8.Ee.B.5

All Common Core: 8th Grade Math Resources

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