Look at this jug. The water has stopped somewhere between the 200 ml mark and the 400 ml mark. It is past 200, but it has not reached 400.

Hands up: how could we work out exactly how much water is in there, when the line sits in between two numbers?

Four jug readings on the board. Before each one, work out what each little step is worth by counting the marks between two numbers. Then read where the water stops.

Watch the last one especially: the water lands exactly halfway between two marks, so its value sits halfway between them too.

Now we'll read four jugs together. Each jug appears on its own, one at a time. Work out one step first, then read the mark the water sits on and check your answer.

Today we read the jug at group stations. Each group has its own jug and water tray. After each careful pour, work out one step and read the level. First fill to 200 ml. Then top up to 500 ml. Then pour some back to 300 ml. Last, fill right up to 1 litre.