For this problem, you will use the multiplication problem $12345.$ Be sure to

clearly explain your thought process for each part.

a$.$ Use the standard algorithm to calculate $12345($no additional explanation is needed,

but all work must be clear, neat and organized$).$ Next, draw an open area model to

represent $12345.$ Naturally subdivide the open area model into parts and then label

the open area model in a way so that the parts correspond to the steps in the standard

algorithm. Describe the connections between the standard algorithm and the open area

model.