Have students discover exponential growth in this very fun lesson about Ally's allowance! Ally asks her father for a special allowance: 1 penny on April 1st, then 2 pennies, 4 pennies, 8 pennies and so forth and so on for all the consecutive days during the month of April. This is a tried and true math lesson and lab that I have created and used for many years with my 7th and 8th grade classes. Students get a "kick" out of learning about the power of exponential growth and wish that they too, ha