Gathering Evidence
Part Two
 Video TranscriptNote: The names used here are not necessarily
the children's nor the teacher's real names.Ms. S.:
    Eddie, do you have some way to respond 
    to David?
    
Eddie:
    I think there is a hun-, 275 in this, 
    'cause we, 'cause we, 'cause there's 25 
    in each little square, and we got this 
    one, and we measured it to get, um, five 
    squares.  We think that there's five flat
    squares in here, and we counted five 
    from each.
     
Ms. S.:
    Okay.
    
Kevin:
    It'd be 25 times five 'cause here'd be 
    one 25 layer.  Then move it, there'd be 
    another 25 layer.  Then another one.  
    Another.  And there would be five of 
    those, so it'd be 25 times five, which 
    would, I think, equals one twenty-five.
    
Ms. S.:
    See how you're, what you're thinking.  
    Now you've heard all those different 
    explanations.  What do you think?
    
David:
    Now I heard that, that she was using,
    uh, purple squares . . .
    
Ms. S.:	
    Um huh.
    
David:
    This purple cube can fit into here, in 
    the middle, and there's 64.
    
Ms. S.:
    'Kay . . .
    
David:
    So, it has to be, like, you gotta take 
    the number outside and plus it, uh, uh, 
    add it times, plus 64.
http://illuminations.nctm.org/reflections/6-8/GatheringEvidence/videoExample3A.html