is useful for pupils to consolidate ideas associated with capacity and to begin to calculate in that context. It allows for good discussion between pupils and between pupil and teacher.
You could initiate some discussion by looking at the bottles pictured here, however having a set of your own bottles/jars would be better.
Give the pupils a long time to both discuss their answers and how they might validate them. Then give them chance to carry out some practical tests to see how close they were.
Tell me about your ideas.
Why do you think this?
Ask the pupils to estimate what level a liquid would be in a larger vessel when it's poured from a smaller one.
The activity Bottles (1)
would be good to try before this. Some pupils made need assistance with any awkward pouring.