Litres, Millilitres and Cubic Centimetres
Primary 5 litres and cubic centimetres questions: 1 ml fills 1 cm³, so change litres to ml, read beaker scales and share a bottle into cups.
Questions in this lesson
Transcript
A kettle holds 3 litres 75 millilitres of water. What is the volume of the water in cubic centimetres? Here's a jug that holds one litre. Fill it to the mark, and you have measured out one thousand millilitres. One litre is one thousand millilitres. Here's a box, 10 centimetres along every edge. 10 centimetres up is 10 layers, each one centimetre thick. Each layer is 10 squares by 10 squares. One little cube is one centimetre every way, and it holds one millilitre. A thousand of those little cubes fill the box, and a thousand millilitres fill the jug. Litres and millilitres cannot be added as they stand. 3 litres is three thousand millilitres. Now both parts are millilitres, so they can be added. Three thousand plus 75 is three thousand and 75 millilitres. Every millilitre is a cubic centimetre, so the volume is three thousand and 75 cubic centimetres. Careful with the litres: the 3 makes three thousand on its own, and the 75 sits at the end.
Your turn. A jug is marked in litres, with 1 litre and 2 litres labelled and five equal gaps between them. The water stands one gap above the 1 litre mark. How much water is in the jug? Give your answer in cubic centimetres. Try it first. Pause if you like. Same rule, and the same first line. From the 1 litre mark to the 2 litre mark is one thousand millilitres, shared into 5 equal gaps. One thousand shared into 5 gaps is two hundred millilitres a gap. The water stands one gap above the 1 litre mark, so it is one thousand plus two hundred. That is one thousand, two hundred millilitres. Every millilitre is a cubic centimetre, so that is one thousand, two hundred cubic centimetres. One amount of water. In litres, in millilitres, in cubic centimetres. A litre is a thousand of them.