Here is a 1.5 l bottle of fizzy water and a 250 ml glass. How many glasses could you pour from the bottle?

Watch the conversion ladder. Litres sit at the top and millilitres three steps below. The label between them shows how much bigger the number gets. Look at where the digits land as the unit changes.

We already met this exact three-column step when we changed kilograms into grams: 1,000 g make 1 kg, so kg → g is × 1,000 and g → kg is ÷ 1,000. See if you can spot what is the same here.

Let's work these together on the ladder:

• 2 l → ___ ml
• 0.75 l → ___ ml
• 1,250 ml → ___ l
• 75 ml → ___ l

Your turn to fill each rung and Check. We cross between litres and millilitres:

• 2.5 l → ___ ml
• 800 ml → ___ l
• 0.125 l → ___ ml
• 3,050 ml → ___ l
• Stretch: 45 ml → ___ l