Grade 8 Math Review Questions Year End

6q-15=81. What is q?

Add 15 to both sides. 6q=81plus 15=96. Divide both sides by 6. 96/6=16

x-6=-1

Add 6 to both sides. Solve for x. x=5

John needs to be at school by 8:00 am. It takes 20 minutes to walk to school, 10 minutes to eat breakfast, and 20 minutes to get ready. What time does he need to get up in order to make it to school and not be tardy?

Add together the 20 minutes, 10 minutes, and 20 minutes. Subtract the minutes from 8:00 am. 7:10 am

What is 30% of 210?

Change 30% to a decimal 0.3, then multiply 0.3 times 210. 63

If 35% of the flowers are blue, and there are 280 flowers, how many are blue?

Change 35% to decimal 0.35, multiply by 280. 0.35 x 280- 98

Sally bought a new dress that cost $30. There is 8% sales tax. What is the total cost?

Change 8% to decimal 0.08, multiply the cost of dress by 0.08, $2.40. Add the tax to the cost of the dress. $30.00+$2.40=$32.40.

n/8=3/24. What is n?

Cross multiply. 3 times 8 divided by 8=1

6/10=8/n What is n?

Cross multiply. 8 times 10 divided by 6=13.3

What percent of 15 is 3?

Divide 3 by 15, then change to percent. 0.2 becomes 20%

3.4y=17

Divide both sides by 3.4 to solve for y. y=5

What is the surface area of a cylinder that has a diameter of 8 and a height of 5? Measurements are in feet.

Divide the diameter by 2 to get the radius=4. To find the surface are of the top and bottom multiply pi x r x r. So, pi x 2 x 2=12.57. Then take pi x 2 x r x height to get that rectangular part. pi x 2 x 2 x 5=62.83. Then add these together, 12,57 plus 62.83=75.4 square feet

What is the volume of a rectangular prism that is 3 by 4 by 5 feet?

Multiply length times width times height. 3x4x5=60 cubic feet

Find the percent of change from 75 to 100. Is this a decrease or an increase?

NEW-ORIGINAL /ORIGINAL. 100-75/100=25/100=25% increase.

What is the volume of a triangular prism with a base that has area 12.5 square meters and a height of 9 meters?

Take the area of the base times the height. 12.5x9=112.5 cubic meters

What is the surface area of a pyramid with a square base with sides 6 inches and a height of 8 inches, without the base?

You have 4 triangles to find. base times height divided by 2.So, 6 x 8 /2=24. There are 4, so 4 x 24=96 square inches.

What is the surface area of a rectangular prism that has width 4 inches, length 6 inches, and height 8 inches?

You have 6 faces to find, and they are in pairs, so 2(4x6), 2(6x8), and 2(4x8). Then add together. 48 plus 96 plus 64=208 square inches

I have a cube-shaped box with sides of length 6 feet. What is the volume in feet? What is the volume in inches?

length x width x height is 6x6x6=volume in feet. 12 inches on a foot, so 6 x 12 to get one side in inches, then that number (72)x(72)x(72) to get cubic inches, In feet, 216 cubic feet, in inches 373,248 cubic inches

What if the volume of a cylinder that has a radius of 3 and a height of 7? Units are cm.

pi times the radius squared times the height (pi)x(3)x(3)x7=197.92 cubic cm.

If there are 325 rabbits and 175 of them are black, what if the ratio of black rabbits to all rabbits?

175/325= 7/13