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If you were to teach someone how to place the decimal in the answer to multiplying decimals, explain how to do it.
If you were to teach someone how to place the decimal in the answer to a addition or subtraction, what would you say?
What is count the place values the the right of the decimals then start the to the right of the product and count that man places to the left; line of the decimals and bring it straight down in the answer.