Grade 9 Nafs Marathon: Beat the clock challenge

What is the absolute value of -10?

• -10

• 0

• 10

• 1

Which fraction represents a repeating decimal?

• ⅔

• ¼

• ⅝

• ⅗

Arrange the numbers in ascending order: -½, ⅓, -0.75, 0.25.

• -0.75, -½, ⅓, 0.25

• -½, -0.75, ⅓, 0.25

• -0.75, -½, 0.25, ⅓

• ⅓, 0.25, -½, -0.75

Simplify 72\sqrt{72}.

• 626\sqrt{2}

• 383\sqrt{8}

• 838\sqrt{3}

• 929\sqrt{2}

Express (2.5×106)×(4×10−3)(2.5 × 10^6) × (4 × 10^{-3}) in scientific notation

• 1.0×1041.0 × 10^4

• 10×10310 × 10^3

• 0.5×1040.5 × 10^4

• 2.5×1032.5 × 10^3

Which of the following is a compound?

• Oxygen (O₂)

• Water (H₂O)

• Saltwater

• Air

What is the pH range of acids?

• 0–6

• 7

• 8–14

• 15–20

Which of the following is a mixture?

• Sodium chloride (NaCl)

• Carbon dioxide (CO₂)

• Saltwater

• Water (H₂O)

Which planet is known as the "red planet"?

• Venus

• Mars

• Jupiter

• Saturn

Which of the following is a renewable energy source?

• Coal

• Natural gas

• Solar energy

• Petroleum