```Integer: Tic-Tac-Toe Four In A Row!Conchita A. Little             Terrell School                               5410 South State Street                               Chicago IL 60609                               (312) 535-1490Objective:

To use a phenomenological approach to the introduction of
integers using a coordinate plane and ordered pairs.

Materials needed:

Chalkboard, color chalk, coordinate grid (drawn on the chalkboard),
numberline, and a large visual thermometer.  Maps are optional.

Strategy:

Discuss integers as a subset of the real numbers, including zero (0),
positive (+) and negative (-) whole numbers.
Ask students to tell other real world uses for integers besides the
thermometer.
Introduce a numberline; allow students to count in a positive, then in a
negative direction starting at the origin zero (0).
Discuss with students the meaning of integers.
Locate a few integers on the numberline.
Emphasize positive and negative numbers.
Place a coordinate grid on the chalkboard.
Explain the coordinate plane, using the numberline as a basis.
Locate points on the coordinate plane first moving horizontally, then
moving vertically.
Tell students the points found on the coordinates are called
ordered pairs.
Use the game of tic-tac-toe four in a row to give students practice
in locating coordinates using integers.

Conclusion:

Teams were chosen to play tic-tac-toe four in a row on the coordinate
plane.  Each team used a strategy to get four coordinates in a row either
horizontally, vertically or diagonally.  Team members located the ordered
pairs successfully to win the game.  The use of quadrants II, III and IV
was encouraged.

References:

Heimer, Ralph T., Trueblood, Cecil R.  Strategies for Teaching Children
Mathematics.  Addison Wesley Publishing Co., Reading, MA., 1977, pages    349-359.```