Real tutor reply (for the tutor screen copy)

Good question, let's do it in small steps.

1. Write down what you are given.
• Mass m = 270 g
• Volume V = 100 cm³

2. Use the density equation.
ρ = m / V

3. Substitute the values.
ρ = 270 / 100 = 2.7 g/cm³

4. Convert to SI units.
1 g/cm³ = 1000 kg/m³
2.7 × 1000 = 2700 kg/m³

Exam tip: check which unit the question asks for before you write your final answer. A correct number in the wrong unit still loses the mark.

You have the method now — try the next one and it will feel much easier.

Real physics card used above: Physics · Density · Year 9