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**Volume Of Solids And Liquids**

Primary 6 Mathematics

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**Chapter Learning Outcomes**

Find an edge of a cuboid/rectangular tank given its volume and the other measurements (2 other edges or area of one face/base) Use calculator to find square root/cube root Find one side of the square base of a cuboid/tank given volume and height Find one edge of a cube/cubical tank given volume Find volume of water and/or height of water level in cuboid/rectangular tank

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**Volume Of Solids - Cube How can you find the volume of a cube?**

Volume = Length Breadth Height Remember that a cube has the same length, breadth and height.

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**Volume Of Solids - Cuboid**

How can you find the volume of a cuboid? Volume = Length Breadth Height

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**Finding edge of a cuboid**

If two of the edges of a cuboid and its volume is given, you can find the value of the third edge.

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Example A cardboard box has a volume of 225 cm2. If the box has a length of 15 cm and breadth of 3 cm, find its height. Volume = length breadth height 15 cm 3 cm height = 225 cm2 Therefore: Height = 225 (15 3) = 5 cm

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**Finding edge of a cuboid**

If the base area or area of one face of a cuboid and its volume is given, you can find the value of the third measurement.

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Example A fish tank has a base area of 126 cm2. If its capacity is litres, find its height. Capacity of tank = litres = 1638 cm3 Capacity of tank = length breadth height = base area height Therefore, height = capacity base area Height of tank = 1638 126 = 13 cm

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Finding Square Root To find the area of a square, we calculate Side Side. If the area of a square is given, we can find the length of the side using square root.

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Example Find the square roots. 5 9 m 25 cm

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Example A metal tank with a square base has a volume of 3630 cm2 and a height of 30 cm. What is the length of its base?

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Finding Cube Root To find the volume of a cube, we calculate Edge Edge Edge. If the volume of a cube is given, we can find the length of the edge using cube root.

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Example Find the cube roots. 4 11 cm 23 m

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Example A plastic cube has a volume of 2744 cm3. Find the length of one edge of the cube.

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Volume Of Liquids We can measure volume of liquids using millilitres (ml) or cubic centimetres (cm3). Using the formulas shown so far, we can solve word problems involving volume of liquids. 1 cm3 = 1 ml

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Example A cubical fish tank is 1/4-filled with 128 ml of water. What is the length of each edge of the tank?

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Example An empty rectangular tank measuring 50 cm by 20 cm by 16 cm is being filled with water flowing from a tap at 8 litres per minute. How long will it take to fill the tank to its brim?

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**Reference - Textbooks Learning Outcomes 6B p. 98–107 6B p.56–60**

Find an edge of a cuboid/rectangular tank given its volume and the other measurements (2 other edges or area of one face/base) 6B p. 98–107 6B p.56–60 Use calculator to find square root/cube root Find one side of the square base of a cuboid/tank given volume and height Find one edge of a cube/cubical tank given volume Find volume of water and/or height of water level in cuboid/rectangular tank 6B p.110–115 6B p.61–68

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