[math-fun] Math or mind-reading?
Holt McDougal Mathematics Grade 7, Common Core Edition Chapter 2 Integers and Rational Numbers Lesson 2-4 Multiplying and Dividing Integers 60. What's the error? A student writes, "The quotient of an integer divided by an integer of the opposite sign has the sign of the integer with the greater absolute value." What was the student's error? [Answer: Majoring in English. In light of this shameful mistake the student's gender and ethnicity were withheld.] 17. Angelina hiked along a 2250-foot mountain trail. She stopped 5 times along the way to rest, walking the same distance between each stop. How far did Angelina hike before the first stop? [Was the start a stop?? If so, 0, If not, 2250/4. Or anything, really. Ah, the start was the 0th stop.] [Teacher: "Show your work."] 15. 63 / 0 30. -42 / 0 42. 0 / (- 3) [For the first two, I gave my student a large magnifier and suggested he burn holes through his answer sheet. But he thinks the answers should be 0 for no logical reason other than "That's what they wanted." Professor Edward Burger's accompanying video says the quotient should be negative if the signs differ. Since the sign of 0 differs from that of 63, the answer to #15 should be -0?] --rwg
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Bill Gosper