Answer each part below using only mental math, and describe your method. a. If 39 is 1% of a number, what is that number? How di
d you find your answer? b. If 39 is 10% of a number, what is that number? How did you find your answer? c. If 39 is 5% of a number, what is that number? How did you find your answer? d. If 39 is 15% of a number, what is that number? How did you find your answer?
