# Activities

• • • ##### Subject Area

• Math: Elementary Math: Math and Literature
• Math: Elementary Math: Number Sense and Estimation
• Math: Elementary Math: Algebraic Thinking

• ##### Author K-5

60 Minutes

• TI-10
• ##### Other Materials
This is Activity 12 from the EXPLORATIONS Book:
Math at Your Fingertips with the TI-10

The following materials are required for this activity:
• Poem: Homework Machine
• Paper cups
• Grid paper (2 centimeter)
• Crayons or markers
• Construction paper
• Glue or paste
• Small boxes with lids
• Tape
• Connecting cubes
• 3" x18" strips of construction paper
• Rulers
• Scissors
• Index cards 3" x 5"

## Mean Machine

#### Activity Overview

Students construct a function machine from a small box. Students use the calculator to discover functions. They create their own one-step and two-step function rules and turn their calculators into a function machine.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 117 - 127 from the attached PDF file for your class
• #### During the Activity

Distribute the page to the class.

Activity A:

• Read the poem Homework Machine to the class

• Activity B:
• Hide one cube inside a cup and call it the plus one machine
• Add a certain number of cubes to the cup
• Pour out all the cubes and count them
• Observe one more cube has been added to the lot

• Activity C:
• Use grid paper and color (black) one square to represent the hidden cube
• Color other squares to represent the visible cubes
• Represent the action with symbols on the calculator
• Repeat the activity with different amounts of hidden cubes and discover the hidden number of cubes

• Activity D:
• Use a sample function box to illustrate number patterns and relations
• Identify the number pattern
• Construct a function machine using a box and index cards
• Create three cards for a number pattern
• Guess the number pattern

• Activity E:
• Use the calculator to show addition number patterns
• #### After the Activity

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