Introduce the most common liquid measurements. Show the kids a container for each size, including a gallon, half-gallon, quart, pint and cup. Smaller measurements, like teaspoon and tablespoon, can also be shown.
Demonstrate how to convert units of liquid measurement. Start with an actual demonstration, such as filling a quart container with liquid from cup containers until it's full. Then, explain the concept mathematically, with the formula one cup equals 0.25 quarts. (reference 1, 2)
Write down the conversions for units of liquid measurement as you go through them. Another example is there are two pints in a quart. Eventually, you will have a helpful conversion chart the kids can use. (reference 2)
Apply what the kids learned to a real-life activity, such as cooking or baking. Use a recipe that has several different units of liquid measurement and make it with the kids.
Make the cooking lesson bit harder by asking that the kids convert the units of measurement first. For example, if a recipe calls for two tablespoons, ask the kids to convert that to teaspoons and use that amount in the recipe. This helps demonstrate the importance of being accurate with liquid measurements.