I would include this tool because it helps with all types of math problems. When doing math one may find that there are a lot of interrelated topics. Students have to know how to multiply polynomials if they want to find the derivative of some math problems. The tool does basic math too. If you need to know how to find the square root of a number, it can do that.
Some may say that this helps with cheating and doing homework. If you ask to show the work on homework, a teacher should not worry about students knowing about this tool. Students for the most part should now have no excuse for a problem being wrong. The internet is great for math learners. Volumes exist online for students to learn different math subjects. With all the information online and this internet tool, students may not even need to go to class.
No matter the grade level, I feel that excel can be used for keeping grades. You can find many important statistics from excel. Whether the class median is very low is an important overlooked statistic. You can also use excel to find out if there was a bad question given on a test. If the best students are getting the problem wrong and most of the class too, then it may have been a bad question. Many good teachers erase bad questions from the test grade.
http://www.webmath.com/polymult.html
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