Tom spent eighteen dollars and seventy-five cents on a large bag of dog food. Because he was not happy about the high price of the food, he decided to figure out how much one cup of it would cost. He calculated that one cup of dog food costs zero point three seven five, or about thirty-eight cents. How many cups of dog food are in the bag?

a. Use rounding to estimate the number of cups. Explain or show your work. (3 points).
b. Calculate the exact number of cups. Explain or show your work. (3 points).
c. Based on the exact answer, is your estimate reasonable? Explain. (1 point).

Question

Tom spent eighteen dollars and seventy-five cents on a large bag of dog food. Because he was not happy about the high price of the food, he decided to figure out how much one cup of it would cost. He calculated that one cup of dog food costs zero point three seven five, or about thirty-eight cents. How many cups of dog food are in the bag?

a. Use rounding to estimate the number of cups. Explain or show your work. (3 points).
b. Calculate the exact number of cups. Explain or show your work. (3 points).
c. Based on the exact answer, is your estimate reasonable? Explain. (1 point).

anonymous · Answer

a.) about 47.5 cups (Round the 18.75 to 19.00 and the thirty eight cents to forty cents, zeros make it easier)
b.) the exact number of cups: 49.3 (i could be wrong but i divided 18.75 by 0.38)
c.) yes. Making the numbers even makes it easier to solve.