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hgross3comcast on 05/20/2010 12:04 PM wrote:
The presentation is technically correct but it leaves room for misinterpretation. For example, students might believe that if they add the same number to numerator and denominator the value of the fraction doesn't change. However 2/5 is not equal to (2 + 1)/(5 + 1). My feeling is that the approach used in this video does not give the students any insight as to what the addition of the two fractions really represents.