Education Technology

# Activities

• ##### Subject Area

• Math: Elementary Math: Number Sense and Estimation

K-5

60 Minutes

• ##### Device
• TI-15 Explorer™
• ##### Other Materials
This is Activity 12 from the EXPLORATIONS Book:
A World of Mathematics: Activities for Grades 4, 5, and 6 Using the TI-15

The following materials are required for this activity:
• Four 4-oz. cans of water-base paint ( white, black, red, and other color )
• 15 small paper cups for mixing paint
• 4 medicine syringes showing cubic centimeters or milliliters ( one for each color of paint )
• 15 small paint brushes
• White construction paper
• Newspapers
• Container of water for washing

• For the teacher:
• Red, yellow, blue transparency film

#### Activity Overview

Students solve a problem involving mixing of paint colors. They use color charts to determine the fractional parts and percentages of colors needed to create tints and shades.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 78 - 86 from the attached PDF file for your class
• Review the four steps of problem solving with the students
• #### During the Activity

Distribute the pages to the class.

• Read the problem and understand how tints and shades are prepared
• Create a tint and shade chart for one color
• Calculate the amount of each color paint used for each tint or shade
• Create a chart showing the fractional amount, percentages, and actual number of liters of each color of paint needed to make a batch of each tint or shade
• Write an explanation about the calculations used

• Converting fractions to percents
• Solve problems involving conversion of fractions to percents
• #### After the Activity

Students analyze different ways in which they used the calculator to solve the problem.

• Review student results
• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary