**Lesson:** Invent-a-color**Grade Level:** 3-5**Skills:** fractions, adding fractions, using measures, mixing colors

**Materials:**

Measuring cups marked off in 1/2, 1/4 and 1/3 gradations

Water and food coloring

Bucket to collect water

In this activity, students will mix fractional amounts of colored water to make new colors. Be prepared for fun and mess!

**Intro:** Discuss the gradations on the measuring cups.

What relationships, if any do they see? Ask:

How many thirds in 1 cup?

How many halves in 1 cup?

How many quarters in 1 cup?

How many quarters in a 1/2 cup

etc.

**Activity/ Demonstration:**Ask: How many 1/2 cups are needed to make 1 full cup?

Pour red water into two measuring cups until each one is 1/2 cup full.

Pour both 1/2 cups into one empty cup to check

**Ask:** How many 1/2 cups would you need to make 2 whole cups of water? (4)

**Demonstration Part 2**: Again, fill two measuring cups with a 1/2 cup of red water. Pour blue water into a third measuring cup until it is 1/2 full of blue water.

How many halves are there now? (3)

**Ask:** What fraction of the halves are blue? this will force students to change gears and look at the fact that they are discussing parts of the set of 3 now. (1/3 are blue)

**Ask**: What fraction of the halves are red? (2/3 are red)

**Demonstration Part 3: **

How much water, and what color will be created when 1/2 cup of red water is poured into the 1/2 cup of blue water?

**Student Activity: **

Students use measuring cups and colored water to invent new colors and record them on the invent-a-color worksheet.

Fill 1 cup 1/2 full of red water.

Fill another cup 1/4 full of blue water.

Compare the amount of water in the blue and red cups.

Which is a greater amount 1/4 or 1/2?

How many quarters are in 1/2?

What is 1/4 + 1/4 equal to?

How many quarters are needed to fill 1/2 cup?

How many quarters are needed to fill 1 cup?

How many quarters are needed to fill 2 cups?How much water will be there in all if 1/4 cup is poured into 1/2 cup?

If a cup is 1/4 full:

How many more quarters are needed to make 1 cup?

What is 1/4 + 3/4?

What color do you think you will get if you pour 1/4 cup of the blue water into 1/2 cup of the red water?