Junk Food Math

Sharon Ross DeWitt Clinton School
6110 N. Fairfield
Chicago, Illinois 60659


The main objective of this miniteach is to teach 3rd through 4th grade students
estimation and introduce percentage.


For each student:

- one zip-lock bag containing 75 randomly chosen Skittles candies and 5 small
paper cups

- classroom set of centimeter grids for graphing results

- worksheet prescribed with a circle in which 75 Skittles can be placed

- worksheet with directions

- box of 8 crayons

Recommended Strategy:

. Distribute zip-lock bags containing Skittles and paper cups.

. Take out paper cups.

. Estimate amount of each color Skittles.

. Record estimated numbers.

. Count all Skittles and record total.

. Place Skittles by color into paper cups.

. Count Skittles by color and record actual amount of each color.

. Compare sets of candies by color using the less than, greater than, and equal

. On centimeter grid, list colors along horizontal axis.

. On centimeter grid, list numbers from 0 to 25 along vertical axis.

. With corresponding color crayon, color bar graphs to represent the number of
each color candy found in the sample.

. Use formula:

Color Number X 100 , to calculate the percent of each color.
Total Number

. On prescribed circle worksheet, form a pie-shaped wedge out of the predominant

. Next to the preceding wedge, form another pie-shaped wedge out of the next
most frequently occurring color.

. Continue making pie-shaped wedges until all colors are used and the circle
is filled.

. Label each pie slice with the percentage number which it represents.

. The "Junk Food Pie" may then either be eaten by the student or the pieces
may be glued to the paper to keep a permanent record of the results.

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