`How Do You Stack Up?Robert Foote                   Walt Disney Magnet School                               4140 N. Marine Drive                               Chicago IL 60613                               (312) 534-5844Objectives:Students will estimate the number of pennies, nickels, dimes, and quarters in  a plastic bag.Students will build stacks of each coin.Students will find the thickness of a penny, nickel, dime and quarter after  measuring their stacks.Students will measure to the nearest centimeter using a ruler.Students will determine how high a stack of \$1000 is in pennies, nickels, dimes    and quarters.Materials needed:4 plastic bags                  rulers486 pennies                     250 nickels470 dimes                       73 quarterschalk Strategy:Have four volunteers hold up four bags with pennies, nickels, dimes, and quarters.  Have each class member write down on a piece of paper which bag has the most coins and which has the most money.  Then give the bags to different groups to count.  Write the results of each count on the board.  Have the group with the most coins split them in half so each group can have a group of coins. Next, have each group (pennies, nickels, dimes, quarters) predict how many of each coin they can stack without falling.  Write predictions on board and then let the groups stack.  Have students imagine a stack of coins \$1000 high.  How high would that stack reach?  Give the following statistics as a comparison: A basketball player is 2 meters(m) tall, the ceiling of most buildings is 4 m, the height of a 10 story building is 40 m, and the height of the Sears Tower is 440 m.  Students may graph each of these and then graph where each stack would fall.  To calculate the thickness of a penny, nickel, dime and quarter, have students measure their stacks and divide by the number of coins.  They will then have a good approximation of the thickness of each coin.  Performance Assessment:Using either the measured thicknesses or the standard thickness for each coin, have students determine how high a stack of 50 pennies, nickels, dimes and quarters would be. References:Page, David and Philip Wagreich.  Maneuvers with Nickels and Numbers. Dale Seymour Publications, 1990.`