Intersection: Checker Board

This week's project involved a continuation of the overlapping concept taught last week. Students were shown an example of a finished project.

Materials:
Drawing pad
ruler
circular lids
crayons

Students were asked who had played checkers before and who could describe a checker board. Checker boards were described as alternating colored squares. Students were then asked if two squares of the same color were ever beside each other. (no) Show example, explain that this is not a checker board but it does alternate squares, and when a circle intersects a square the color inside the circle is opposite the color outside.

Instructions:
Position paper horizontally, draw 3-5 vertical, but not intersecting or parallel lines. Rotate paper vertically, draw 3-5 vertical but not intersecting each other (they will intersect the horizontal lines) or parallel lines. Collect rulers.

Then have students trace circles: 1 circle for first graders, 3 intersecting circles for third graders. Collect lids.

Each student will select one color and beginning in the top left hand square, color that square. Continuing in that column, color in every other square but not inside the circles. Color only outside the circles. When all outside squares are colored, every colored square that intersects a circle will be a uncolored square inside the circle, and every uncolored square that intersects a circle will be colored inside the circle. Everything inside the circles will be opposite. Where the two circles intersect, that intersection will be opposite again.

When coloring have the students color lightly; lighter colors can be erased if mistakes are made or if needed a second color can be used to cover up the mistake. When a second color is introduced all uncolored squares will now be that color.

Vocabulary:
horizontal
vertical
parallel
intersecting
overlapping
opposite