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making dot arrays
I have a question on math homework that asks : What do we call the numbers that cannot be arranged into 2row arrays? 
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my son is in fifth grade and he is making dot arrays he said that the even numbers are called factors but isn't sure what the odd numbers are called, anyone know? 
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what are the numbers calleed that we cant use in 2  row arrays I'm curious to know what class is making dotarrays? 
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What are numbers that cannot be arranged into 2row arrays called? 
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If "u = (2,2,1)", "v = (3,1,0)" and "w = (1,7,8)", verify that "u (dot) (v + w) = u (dot) v + u (dot) w". My work: LHS: u (dot) (v + w) = (2,2,1) (dot) (4,6,8) = [(2,2,1) (dot) (3,1,0)] + [(2,2,1) (dot) (1,7,8)] = [u (dot) v] … 
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What are dot arrays? What would a dot array for $1.84 look like? 
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to make a 14dot array that has exactly two rows, is this going to have a total of 14 dots or will it be 14 dots per row 
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my grandaughter is doing array dot to dot sample make as manydifferent arrays as possible number 5 how would i go about doing a array with dots please, desperate in need to keep up with my grandaughters homework. 
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show me examples of dot arrays 
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