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.
