What's My Ratio?

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Elementary Math: Geometry

Level

K-5

Activity Time

60 Minutes

TI Calculator

TI-15 Explorer™/TI-10

Other Materials

Ruler, string or measuring tape
Larger paper
Pictures with enlarged or reduced copies
Pencils and markers

Resource Types

Lessons

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What's My Ratio?

Activity Overview

Students use linear measurement and calculators to investigate proportionality and determine the constant ratio between similar figures.

Before the Activity

See the attached PDF file for detailed instructions for this activity

Print student activity sheets pages 92 - 93 from the attached PDF file for your class

During the Activity

Distribute the pages to the class.

Follow the activity procedures:

Draw a picture on centimeter grid paper

Decide to either increase or decrease the size of the picture, predict the dimensions in the increased or decreased version, and discuss reasoning

Draw the increased or decreased picture on grid paper, keeping the picture's original shape, to test the predictions

Discuss the use of ratio (comparing the measurements of corresponding parts) to describe how the picture has been increased or decreased

Divide students into groups

Give each group an interesting picture and a reduced or enlarged copy of the same picture

Ask each group to measure several pairs of corresponding parts on the two pictures, record their data on the recording sheet, and make some conclusions about copies of pictures

After the Activity

Review student results

As a class, discuss questions that appeared to be more challenging

Re-teach concepts as necessary

Download Files

Download All Files (ZIP)

Before the Activity Files

Teacher Notes PDF

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Elementary Math: Geometry

Level

K-5

Activity Time

60 Minutes

TI Calculator

TI-15 Explorer™/TI-10

Other Materials

Ruler, string or measuring tape
Larger paper
Pictures with enlarged or reduced copies
Pencils and markers

Resource Types

Lessons

Report an Issue

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What's My Ratio?

What's My Ratio?

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