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Math
Lesson
for Earth Day
Objective:
The
students will explore fractions.

Materials
 Circle
Worksheet
 Crayons  blue and brown
 Balloons  blue and black
or green. Have them blown up so that 3/4's of
them are blue and 1/4 are black or green. (Try
to have about 1 balloon per student.)
 Globe

Procedure
 While holding up the
globe, discuss how the earth is covered by more water
than land. In fact, almost 3/4 (71%) of the
earth's surface is covered by water.
 Give each child one of the
blown up balloons. Have them cluster the
balloons together in a designated area. Discuss how the
blue balloons represent the amount of water on earth's
surface and the black/green balloons represent the
land. Observe how much more water than land
covers the earth. This will help create a good
visual representation.
 Pass out the Circle
Worksheet. (For younger students, before
running off this worksheet, divide the circle into
1/4's to give them lines to cut on. Older
students may use rulers and divide the circle into
1/4's on their own.)
 Have the students color 3
of the 1/4's blue and the other 1/4 brown or
green. Discuss how this again represents the
amount of water vs. the amount of land covering
earth's surface. They should then cut out their
circle into the 4 pieces.
 Work as a class to explore
the fractions. How many 1/4's make 1/2?
How many make a whole? The amount of depth will
depend on the age of the students. Older
students may be able to follow up by writing some
fraction problems involving 1/4's. Challenge
them by combining their circle parts with a partners
and writing more complex problems.

Other
Lesson Ideas
 Similar to the above
lesson, work with 1/2's by discussing the equator and
how it divides the earth in half.
 Work with place
value. Place value boards and manipulatives
would be ideal for this lesson. All the numbers
the students work with in the lesson could be numbers
relating to the earth. For example, 7 (for 7
continents), 365 (for how many days it takes the earth
to revolve around the sun), 24 (for how many hours it
takes the earth to rotate), etc.
 Complete story problems
relating to time zones. Use the following link for
help http://www.timeanddate.com/.
 Have a lesson on 3
dimensional shapes, including spheres, cylinders,
cones, and cubes. Refer to the Bubble
Day Math Lesson for ideas.


