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How do you describe elevations that
are above sea level and below sea
level?
In this lesson you will learn how
to use positive and negative
numbers by thinking about
situations with elevations.
Let’s Review
6
4
2
0
Negative
Numbers
-2
-4
-6
Positive
Numbers
A Common Mistake
200 feet below sea level
-200 feet below sea level
Core Lesson
2’
0’
-2’
Sea level is another way of referring
to 0.
Core Lesson
700’
220’
0’
Core Lesson
3’
0’
-5’ or
5’ below sea level
-5’
Core Lesson
3’
0’
-400’ or
400’ below sea level
-400’
Core Lesson
Some places on land are actually below sea
level!
Death Valley in California is 282’ below sea
level or –282’.
–282’
In this lesson you learned how to
use positive and negative numbers
by thinking about situations with
elevations.
Guided Practice
1. A hiker climbs 150 feet up Mt.
Whitney. Is this a positive or negative
number?
2. A submarine dives 200 feet below sea
level. How would you write this?
Extension Activities
Do a web search to find elevations for
different parts of the country.
What is the elevation where you live?
Extension Activities
Do a web search to find the highest elevations in
the world and the lowest.
Where are most of the highest mountains
located?
Extension Activities
Do other planets have mountains?
Pick a planet and research its elevations. How
do these compare to earth’s?
Quick Quiz
1. Mt. Everest is 29,029 feet above sea
level. Is this a positive or negative
number?
2. If you go scuba diving and go 50 feet
below sea level, how would you write the
elevation?