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# opposite quantities that combine to make zero

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## jessica wilson

on 10 September 2013

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#### Transcript of opposite quantities that combine to make zero

quantities that combine to make zero
Temperatures on a thermometer
Temperatures above zero degrees are positive (+10) and temperatures below zero degrees are negative (-10).
Sports Scores
If your favorite football team gained 4 yards during the big game, it could be represented by +4. Should your team lose 4 yards, it could be represented by -4.
Weight gain and loss
Sam gained 8 pounds while on a Caribbean cruise (+8), but lost 8 pounds (-8) after he returned home.
Geography
A location in death valley has an elevation of -282 feet (which is below sea level), while a location near Coffin Peak has an elevation of +282 feet (which is above sea level).
Altitude
An airplane leaves the airport and climbs to an altitude (height) of 2500 feet (+2500). To land, the plane must lose 2500 feet of altitude (-2500).
Opposites
Positive and negative numbers can represent or describe many different situations which demonstrate the concept of opposites!
Write this
John earned \$5.oo doing his chores on Sunday. On Monday, John bought a video game that cost \$5.00. How much does John have left?
Why?
The amount John earned is a quantity and the amount John spent is a quantity. Why do they combine to make zero?