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Using the definition of subtraction to determine the subtraction equations that are related to each of the following addition equation: a.8+7=n b.14+x=25 c.r+s=t my answers are this: a. n7=8 b.x=2514 c.ts=r did I do these right? 
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Consider the following students method of solving the proportion 8/5 = 20/x and determine whether the methods were correct: Richie: First I divided 20 by 8 and got 2 1/2. Then I multiplied 2 1/2 by 5 and got 12 1/2 for my answer. Martha: … 
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when do you need to regroup in subtraction and explain regrouping steps? 
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Use 0 1 2 3 4 5 6 7 only once tomfind the smallest answer possible in subtraction 
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Use the digits 0 1 2 3 4 5 6 7 only once to find the smallest answer possible in subtraction