seperate the pennies you have into two groups: one with pennies dated before 1982 and the other pennies dated after 1982. compare the two groups. record any similarities or differences in size or appearance that you notice between the two groups.
Pennies dated before 1982 are made of 95% copper and 5% zinc and weigh 3.11 grams. They have a diameter of 19.05mm and a thickness of 1.55mm. Pennies dated after 1982 are made of 97.5% zinc and 2.5% copper and weigh 2.5 grams
