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Which estimation could be used to make sure the answer is reasonable? Daniel had 5.25 feet of pipe for a project. He bought another 7.5 feet to complete it. He only used 9.25 feet for the project. How much pipe did Daniel have left over? A. Answer: The amount left over was 22 feet. Estimation: 5.25 + 7.5 is about 13. 13 feet + 9 feet = 22 feet The amount left over was about 22 feet. B. Answer: The amount left over was 5.75 feet. Estimation: 5.25 + 7.5 is about 14. 14 feet - 9 feet = 5 feet The amount left over was a little more than 5 feet. C. Answer: The amount left over was 3.5 feet. Estimation: 5.25 + 7.5 is about 13. 13 feet – 9 feet = 4 feet The amount left over was about 4 feet.