Mathematics in Context: Ratios and Rates

Encycbrita, "Mathematics in Context: Ratios and Rates"
Holt McDougal | 2006 | ISBN: 0030396298 | 68 pages | PDF | 4,3 MB

Dear Student,
Welcome to the unit Ratios and Rates. In this unit you will learn many
different ways to make comparisons.
Do you have more boys or girls in your class? If you count, you might
use a ratio to describe this situation. You can make comparisons
using different types of ratios.
You might have noticed speed limit signs posted
along highways and streets. The rate a car travels
on a highway is usually greater than the rate a
car travels on a street. You can make comparisons
using rates.
You use ratios to make scale drawings.
Architects use scale drawings to design
and build buildings. They create sets of
working documents, which contain a
floor plan, site plan, and elevation plan.
Maps are also scale drawings.
Have you ever looked at a cell through a microscope?
The magnification of the lens sets the ratio between
what you see and the actual size of the cell.
Architects, engineers, and artists often make scale models of objects
they want to construct. Many people have hobbies creating miniature
worlds using trains, planes, ships, and automobiles. When you look
through a microscope, you see enlargements of small objects.
In all instances, ratios keep everything real. We hope you learn efficient
ways to work with ratios and rates.
Sincerely,
The Mathematics in Context Development Team

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