Abbeygurl4 Posted October 8, 2012 Share Posted October 8, 2012 My ds is on lesson 74, lesson practice problem "c". C. Eighty is 0.4 of what number? The method they want him to use is : 80 = 0.4 x Wn 80/0.4 = 0.4 x Wn/0.4 ( I couldn't type it as a fraction) 200 = Wn DS's method is : 80 = 0.4 of X 0.4 = 2/5 (80 divided by 2) 5 = 200 My question is : Is there a reason behind Saxon having him do this problem a specific way or can ds use his method? Ds says that the Saxon method is very confusing to him. I'm not sure what to do. Quote Link to comment Share on other sites More sharing options...
regentrude Posted October 8, 2012 Share Posted October 8, 2012 My ds is on lesson 74, lesson practice problem "c". C. Eighty is 0.4 of what number? The method they want him to use is : 80 = 0.4 x Wn 80/0.4 = 0.4 x Wn/0.4 ( I couldn't type it as a fraction) 200 = Wn DS's method is : 80 = 0.4 of X 0.4 = 2/5 (80 divided by 2) 5 = 200 My question is : Is there a reason behind Saxon having him do this problem a specific way or can ds use his method? Ds says that the Saxon method is very confusing to him. I'm not sure what to do. There is no difference - he is doing exactly the same thing. Whether he calls the fraction 0.4 or 2/5 makes no difference. He should, however, learn to properly write out his procedure, using a variable for the unknown quantity: 80 = 0.4 of X = (2/5) X 80/ (2/5)=X X=200 Quote Link to comment Share on other sites More sharing options...
curlylocks Posted October 8, 2012 Share Posted October 8, 2012 There is no difference - he is doing exactly the same thing. Whether he calls the fraction 0.4 or 2/5 makes no difference.He should, however, learn to properly write out his procedure, using a variable for the unknown quantity: 80 = 0.4 of X = (2/5) X 80/ (2/5)=X X=200 :iagree: Quote Link to comment Share on other sites More sharing options...
Abbeygurl4 Posted October 8, 2012 Author Share Posted October 8, 2012 There is no difference - he is doing exactly the same thing. Whether he calls the fraction 0.4 or 2/5 makes no difference.He should, however, learn to properly write out his procedure, using a variable for the unknown quantity: 80 = 0.4 of X = (2/5) X 80/ (2/5)=X X=200 Gotcha! Thank you! Quote Link to comment Share on other sites More sharing options...
boscopup Posted October 8, 2012 Share Posted October 8, 2012 I would also make sure he knows how to divide by a decimal, since they were clearly wanting him to practice that. 0.4 was easy to convert to a fraction, but what if the problem was "80 is .12345 of what number?" Then he'd want to use the decimal (and long division by .12345 probably isn't real exciting :lol:). Quote Link to comment Share on other sites More sharing options...
Abbeygurl4 Posted October 9, 2012 Author Share Posted October 9, 2012 I would also make sure he knows how to divide by a decimal, since they were clearly wanting him to practice that. 0.4 was easy to convert to a fraction, but what if the problem was "80 is .12345 of what number?" Then he'd want to use the decimal (and long division by .12345 probably isn't real exciting :lol:). Good point, I'll make sure. Quote Link to comment Share on other sites More sharing options...
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