Tia's teacher asked her to find the product of 8 and 207 in her head. Which of the following describes the best way for Tia to mentally calculate the answer?
a. Multiply 8 by 200 and subtract 8 times 7.
b. Multiply 8 by 200 and add 8 times 7.
c. Multiply 8 by 210 and subtract 8 times 7.
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