**Junk Food Math**

Sharon Ross DeWitt Clinton School

6110 N. Fairfield

Chicago, Illinois 60659

312-508-4025

**Objective**:

The main objective of this miniteach is to teach 3rd through 4th grade students

estimation and introduce percentage.

**Materials**:

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

signs.

. 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

color.

. 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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