Return to Mathematics IndexGetting the Goods on Graphing

Velma Elois Rouse DeWitt Clinton

6110 N. Fairfield Av.

Chicago IL 60659

312-534-2025Objectives:

To graph ordered pairs in the coordinate plane

To identify ordered pairs in the coordinate plane

To write the coordinates of points shown on a plane

To create designs or pictures using ordered pairsMaterials needed:

Graph paper (3 or more sheets per student)

Rulers (1 per student)

Pencils (1 per student)

Overhead projector

Overhead projector transparencies

Maps (2 per student)Strategy:

Give each student a map that has the index and grid markings removed. Instruct

the students to locate certain points. After a brief span of time, distribute

the maps with indexes and all markings in place. Again, instruct the students

to locate certain points. Lead the students to discover the usefulness of

grids.

Distribute graph paper. Have the students construct a coordinate plane.

Demonstrate on the overhead projector. Label the axes, stressing that the

horizontal axis is x and the vertical axis is y. Explain the point of origin

and the negative and positive x and y locations. Allow sufficient time for

students to practice locating points and naming coordinates.

Have the students locate ordered pairs on their graph paper and connect the

points in order. Plan for the connected points to form a geometric figure.

Prepare in advance a different set of ordered pairs for each student. Plan for

the resulting figures to coincide with a current event, holiday, or school

program. Display the finished graphs in a prominent place.Performance Assessment:

Each student will create his or her own picture or design on graph paper and

write the ordered pairs. The ordered pairs will then be given to other

students. The student who created the design will be expected to correctly

write ordered pairs that will duplicate the design. The student who graphs the

ordered pairs will be expected to correctly duplicate the design. Both of these

performances should be completed with 95% accuracy.Conclusion:

The students will realize that the skills they have acquired will be useful in

many areas besides mathematics. Other disciplines that utilize graphs are

science, geography, economics, and computers. With the use of and interest in

computers continuing to grow, students will be made aware of a career choice in

computer-aided design (C.A.D.).Multicultural Statement:

Africans invented rectangular coordinates by 2650 B.C. and used them to make

scale drawings and star-clocks in ancient Egypt.