Partners combine their pennies.
Each grabs a handful and then counts and records the amount using both
cents- and dollar-and-cents notation. For example, 13 pennies
would be recorded as both 13¢ and $0.13.
Partners compare their amounts, and then
figure out and record how many more or less (the difference).
They then combine the amounts (counts) and record how many in all (the
sum). Partners repeat the penny grabs several times.
