Question: Explain why the scratch algorithm works. Question content area bottom Part 1 Choose the correct answer below. A . The scratch marks represent the exchanges

Explain why the scratch algorithm works.
Question content area bottom
Part 1
Choose the correct answer below.
A.
The scratch marks represent the exchanges and a way to keep track of them.
B.
The scratch method scratches out numbers that are difficult to add.
C.
The scratch method does not work.
D.
The scratch method adds the same amount to both numbers to make addition easier.

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