6.1+Scaling+Up+or+Down6.1+Scaling+Up+or+Down6.1+Scaling+Up+or+Down6.1+Scaling+Up+or+Down+-+2010-2011

**KF** **Big Idea: Many important practical and mathematical applications involve comparing quantities of one kind or another; it is important to know which method to use and how we should use them?****Essential Question:** **Which comparing strategies work best in which situations?**
 * 1/13/11**
 * // T.rex //**** weighed about 8,100 kilograms and reached heights of up to 6 meters – almost as tall as a two-story house! Archeologists have uncovered //T.rex// skulls 1 meter long and //T.rex// incisors (the longest teeth) 15 centimeters long. **


 * A “larger than average human being can be about 2 meters tall and weigh 90 kilograms. Human incisors are about 1 centimeter long, and a large human skull can be about 20 centimeters long. **


 * How big was //T.rex// compared to a “larger than average” human being? **


 * Write a paragraph to help someone younger than you understand how the size of //T.rex// compares to the size of a human. Be very specific about the comparisons you are making. **

T.rex's were much bigger than 'bigger-than-average' people today. 15 human teeth can fit in a T.rex tooth. A T.rex skull can be up to 5 times a human skull. A 'bigger-than-average' human is only 1/3 the size of a T.rex, and weighs 1/90th of the weight of a T.rex.

Follow Up

The scale factor would be ÷3. 2. ** How long were the incisors of this young //T.rex//? ** The incisors would be approximately 5 centimeters long. 3. ** How long was the skull of this young //T.rex//? ** The skull would be approximately 33 centimeters long.
 * 1. Suppose an infant //T.rex// was the same height as the human described in the problem and was similar to an adult //T.rex//. What would be the scale factor between a grown //T.rex// and the infant //T.rex//? **