Challenging Math for Grade 8

Simplify the expression: 3x + 5x - 2 + 7.

• 5x + 9

• 10x - 2

• 3x + 7

• 8x + 5

Solve for x: 2x + 3 = 15.

• 6

• 10

• 8

• 4

If a = 3 and b = 4, evaluate: 2a^2 + 3b.

• 30

• 25

• 20

• 35

What is the value of x in the equation: 5(x - 2) = 3x + 4?

• -1

• 10

• 7

• 5

Find the area of a triangle with base 10 cm and height 5 cm.

• 30 cm²

• 25 cm²

• 20 cm²

• 15 cm²

Calculate the circumference of a circle with a radius of 7 cm.

• 50.24 cm

• 28.00 cm

• 21.99 cm

• 43.98 cm

If the angles of a triangle are in the ratio 2:3:4, find the measure of the largest angle.

• 100 degrees

• 80 degrees

• 60 degrees

• 90 degrees

A rectangle has a length of 12 cm and a width of 5 cm. What is its perimeter?

• 30 cm

• 40 cm

• 28 cm

• 34 cm

Interpret the following data: The scores of 5 students are 78, 85, 90, 70, and 88. What is the average score?

• 82.2

• 90.0

• 85.0

• 80.5

In a class of 30 students, 18 are girls. What is the probability of randomly selecting a boy?

• 0.6

• 0.5

• 0.2

• 0.4