Question: 7. Mr. Lewis teaches second grade. He has been using take-away problems to illustrate subtraction. A district text contained the following problem: Vanessa's mother lost

7. Mr. Lewis teaches second grade. He has been using take-away problems to illustrate subtraction. A district text contained the following problem: Vanessa's mother lost 23 pounds on a diet last year. Vanessa herself lost 9 pounds on the diet. How many more pounds did Vanessa's mother lose? Most of Mr. Lewis's students were unable to work the problem, and he was very discouraged because he had spent so much time teaching subtraction. Do you have any advice for him? his Jobiano)

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