1. Take a cup with 10 red/yellow chips. 2. Shake it gently, spill it carefully on the table. 3. Sort into reds and yellows. 4. Match your screen set to the table set with red and yellow using the tool. 5. Use the tool to type the fraction of red chips and the fraction of yellow chips like this: 3/8 and 5/8. 6. Repeat.