Q3. Wei Ming buys wrapping paper at ten cents per square centimetre. If the area is 300 sq cm, what is the cost?
✔ Multiply area by cost per unit: $300 \times 0.10 = 30$ dollars.
Show transcript
[Slide 1] What Is A Net?
Imagine opening a tissue box at Tampines MRT. You see the flat paper shape inside. This flat shape is called a net.
[Slide 2] Rules For Cuboids
A cuboid has three pairs of identical faces. Top matches bottom, front matches back. Left side equals right side always.
[Slide 3] Worked Example With Ravi
Ravi buys paper at the hawker centre. He draws a bar model with six segments. Each segment is one face area added up.
[Slide 4] Common Mistake To Avoid
Students often miss the top or bottom face. Do not forget hidden faces in the net. Check your total before folding mentally.
[Slide 5] PSLE Recap Summary
Remember to find all six face areas. Add them together for total surface area. You are ready for the PSLE exam.