Name:__________________________________________ Period:_________________
No Need to Count Your Pennies
Have you ever saved pennies, nickels or dimes? If you have, you probably took them to the bank to exchange for dollars. Tellers at the bank don’t have to count each coin to determine how much money is there. They use the properties of the coins instead.
A penny, nickel and dime each have a particular mass and thickness. A roll of coins will have a certain mass and length depending on how many coins are in the roll.
Objective: To determine the # of pennies in an unknown roll without opening it and counting them.
Unknown Roll #: _______________
Procedure:
Data table:
Number of coins 
Mass of pennies (grams) 
Mass of nickels (grams) 
Thickness (mm) 
1 
2.47 
4.85 

2 
4.98 
9.84 

3 
7.51 
14.78 

4 
10.56 
19.76 

6 
16.04 
29.75 

10 
27.95 
49.81 

15 
41.70 
74.96 

25 
68.35 
119.98 

row 

X 

Graphing: Make a line graph with the mass information in the data table.
What is the closest value for the # of coins? ____________________________________
Ask your teacher how many coins were actually in the row. Write this number here. ______________________________________
Questions: