I completely agree with Lauren, Nicora does a great job with this topic! Another helpful presentation is this one: http://commoncore.tcoe.org/docs/default-source/Math-docs/2014-cmc-south-2-5-tape-diagrams-td.ppt?sfvrsn=0, because it shows the progression of tape diagram use.
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This may be helpful:
Tape diagrams help students divide things into equal portions with a nice visual aid. They can use trial and error starting with a reasonable guess about how to divide a number into equal parts. The link above shows an example of this. Hope it helps!
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