8th Grade Math

Linear Equations

100

x+7=19

x=12

200

3x=27

x=9

300

2x−5=17

x=11

400

4(x−2)=20

x=7

500

5x+8=3x+24

x=8

Exponents & Scientific Notation

100

3^2

9

200

2^4

16

300

5^2×5^3

5^5=3125

400

Write in scientific notation:
450,000

4.5×10^5

500

Write in standard form:
7.2×10^3

7,200

Geometry

100

What is the area of a rectangle with length 8 and width 5?

40 square units

200

Find the circumference of a circle with radius 3. Use π=3.14π=3.14

18.84

300

Find the volume of a cube with side length 4.

64 cubic units

400

What is the measure of each angle in a triangle if all angles are equal?

60°

500

Use the Pythagorean Theorem to find the missing side:

a=6,b=8

Functions

100

Is this relation a function?
(1,2),(2,3),(3,4)

Yes

200

Find the slope:
Points (2,4) and (4,8)

2

300

What is the y-intercept of:
y=3x+7

7

400

Find the value of y:
y=2x+1 when x=5

11

500

Find the slope of the line: y=-3x+2

-3

Statistics & Probability

100

Find the mean:
2, 4, 6, 8

5

200

Find the median:
3, 7, 9, 10, 12

9

300

A bag has 5 red marbles and 5 blue marbles.
What is the probability of drawing a red marble?

1/2 

400

What is the mode of:
4, 5, 5, 6, 7, 7, 7

7

500

A spinner has 8 equal sections. Two sections are green.
What is the probability of landing on green?

2/8=1/4