Q1. A tank is 10 cm long, 5 cm wide, and 20 cm high. What is the volume of water if it is full?
✔ Multiply length, width and height: 10 times 5 times 20 equals 1000.
Q2. Convert 5000 cubic centimetres to litres.
✔ Divide cubic centimetres by one thousand to get litres.
Q3. If water costs 50 cents per litre and you have 2 litres, how much do you pay?
✔ Multiply the cost per litre by the number of litres.
Show transcript
[Slide 1] What Is Liquid Volume?
Welcome class. Today we find the volume of liquid in a tank. Imagine stacking blocks to fill the empty space inside.
[Slide 2] The Volume Formula Rule
Remember the formula for rectangular prisms. Always check your units before calculating. This gives the total capacity of the tank.
[Slide 3] Siti's Tank at Tampines
Siti buys a tank at Tampines Hawker Centre. The tank measures forty by twenty-five centimetres. It is filled to two-thirds of its height.
[Slide 4] Drawing the Bar Model
We draw a bar model to show the fraction. Two parts out of three represent the water level. This helps us find the actual water height.
[Slide 5] Watch Out For Mistakes
Many students forget to convert cubic centimetres to litres. You must divide the volume by one thousand. Accurate volume helps calculate water costs in dollars.
[Slide 6] Summary and Next Steps
Recap the steps for PSLE success. Draw bars, calculate volume, then convert units. Practice with Wei Ming's water bottle problem.