`Ratio and ProportionValesta Cobbs                  John Fiske Elementary School                               6145 S. Ingleside Ave.                               Chicago IL 60637                               (312)535-0990Objectives:     The students will use the phenomenological approach to complete the activities, calculate ratios and proportions and compare and contrast group data with class data.Materials Needed:     Four 16 oz. bags of candy      Rice (2 different amounts of the same brand)     Cereal (2 different amounts of the same brand)     Tuna (2 different amounts of the same brand)     Canned Corn (2 different amounts of the same brand)     Gum (2 different amounts of the same brand)     Canned beans (2 different amounts of the same brand)     6 sets of 10 ratio cards with easily identifiable items to be       compared (For example: girls to boys)      TimerStrategy:      Review the definition of a ratio.  Ask the students to write the number of vowel letters and consonant letters in their name as a ratio of vowels to consonants on a sheet of paper.  Ask three or four students to come to the board and write their name and the ratio of vowels to consonants.       Divide the class into groups of five.  Give each group ten ratio cards. Explain the directions and set the timer for five minutes.  After the elapsed time, tell the students to stop.  Ask one student from each group to write the group data on the board.  Have the students line up on opposite sides of the room according to the ratio.  For example, if the students identify the ratio of boys to girls, then the girls will line up in the front of the room and the boys will line up in the back of the room.  Have one student count the number of boys and girls and check the answer on the board to make sure that it corresponds to the numbers counted.      Review the definition of proportion.  Give each group a bag containing at least 10 pieces of candy.  Clearly mark or label the price of the bag of candy.  Ask the students to find the cost of one piece of candy.  Have a student from each group record the group data on the board.  Ask a member of each group to orally state the unit price of one piece of candy in the bag of the group.  Ask the class to determine if the data written on the board is correct.      Give each group two different amounts of the same product.  Ask the students to determine the cost of one ounce of each product and the best buy.  Select one member of each group to write the group data on the board.  Ask a member of each group to explain the data written on the board for that group.  Have the class check the data written on the board. Performance Assessment:     Give each group two different amounts of another product.  Ask the group to determine the cost of one ounce of the product and the best buy.   `