Mathematics Challenge for Grade 9

Identify whether 3/4 is a rational number.

• 3/4 is a whole number.

• 3/4 is an irrational number.

• Yes, 3/4 is a rational number.

• 3/4 cannot be expressed as a fraction.

Which of the following is a rational number: √2, 0.75, π?

• 1.5

• 0.75

• -3

• √3

Apply the exponent rule: Simplify (2^3) * (2^2).

• 16

• 24

• 32

• 10

What is the value of 5^0?

• 0

• 1

• 5

• 10

Simplify the expression: (x^2)^3.

• x^6

• x^9

• x^3

• x^5

Calculate 20% of 150.

• 35

• 40

• 30

• 25

If a shirt costs $40 and is on sale for $30, what is the percentage discount?

• 15%

• 30%

• 40%

• 25%

A car is bought for $20,000 and sold for $18,000. What is the loss in dollars?

• 3000

• 2500

• 2000

• 1500

If a product is sold for $120 with a profit of $30, what was the cost price?

• $90

• $70

• $80

• $100

Simplify the expression: 3x + 4x - 2x.

• x

• 5x

• 6x

• 3x + 2x