8th Grade Math Jeopardy

Number Skills

100

(23-30)x5-(-5)=

-30

200

Evaluate -3⁴

-81

300

Estimate square root of 17

Around 4.11 or 4.12

400

Simplify.  55x⁶y⁷ /5x⁴y⁷=

11x²

500

Calculate and write your answer in scientific notation form:  2,0 x 10⁷ x8,0 x 10²=

1,6x10¹⁰

Algebra

100

Evaluate y-x/3, if x=3, y= -7

-8

200

Solve 5x-3x=4x-2

x=1

300

-3x(x²+2x-2)+6x²+2x³-6x

-x³-12x

400

45/16 + 3/2 n = 7/4 n - 19/16

n=16

500

A cross country replay race is 3500m long. The race includes three legs. The second leg is 250m shorter than the first and the third length is 3 times longer than the second. How long is the first leg? 

900m

Graphing

100

What is the y-intercept of this function y=2x-3?

y-intercept is -3

200

Is this function y=-x+4 a proportional graph? 

NO

300

What is the slope of a line that passes through the points (-1,1) and (3,4)?

3/4

400

What is the slope of this function 3x-2y=12?

3/2 or 1,5

500

What is the Points of intersection of this two functions y=3x-2 and y=-x+1? 

(0.75, 0.25)

Fraction

100

What is 3/7 of 35kg?

15kg

200

Calculate 1 5/6 + 3 3/5 =

5 13/30

300

Calculate 2 1/7 divide by  2 1/2

6/7

400

8/5 of a kilogram costs 320kr. How much does 1 kg cost? 

200kr

500

4x²/5y³  x   5y²/4x³

1/xy

Percent

100

20 of the 30 students passed

the final exam. What percent of the students passed?

66.7%

200

In a bag of Nonstops there are on average 50 red nonstops. This is 20% of all the nonstops in the average packet. How many nonstops are there

in total?

250

300

Sune bought a washing machine and she pays 350 kr every month for one year. If she had paid all the cost at one time, she would pay 3600 kr. How much more expensive to pay by installments (avbetalning) than paying all the cost directly? 

Around 16,7%

400

Sara bought a car for 80 000kr. The value of the car decreases by 5% per year. How much will the car value after 4 years? 

65160.5kr

500

Rakel made a game. The number of users increases 25%. After three months, she has 8000 users. How many users did she have at the beginning of the first month? 

4096 users

Geometry

100

Calculate the surface area of a rectangular prism with length 30cm, width 20cm and height 10cm. 

2200cm²

200

Convert 26000 cm² =             m²

2,6 m²

300

Calculate a cone's volume if the radius of the base is 5cm, and the height is 10cm. 

262 cm³

400

Calculate the area of a circle sector, if the raduis is 50m, and the angle of the sector is 120 degree. 

Around 2617 m²

500

One carton has the measure of 560mm x 385mm x 350mm. If you want to place a stick which is 75cm long in it, can you do it? 

yes, diagonal is 76.5cm.