Question

Which estimation could be used to make sure the answer is reasonable? Claudia mixed 16.7 pounds of sand with 12.6 pounds of soil. She used 22.1 pounds of this mixture to fill a garden pot. How much of the mixture was left over? A. Answer: The amount left over was 7.2 pounds. Estimation: 16.7 + 12.6 is about 30. 30 pounds – 22 pounds = 8 pounds The amount left over was a little less than 8 pounds. B. Answer: The amount left over was 51.4 pounds. Estimation: 16.7 + 12.6 is about 30. 30 pounds + 22 pounds = 52 pounds The amount left over was about 52 pounds. C. Answer: The amount left over was 5.9 pounds. Estimation: 16 + 12 is about 28. 28 pounds – 22 pounds = 6 pounds The amount left over was a little less than 6 pounds.
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Answer 1

The answer for your question is a). Because if you add 12.6 pounds by 16.7 pounds you will get 29.3 as your answer.the estimated answer is 30 and,22.1 estimated is 22.Finally,you just subtract 30 by 22 and you get your answer as 8.