1. Play with manipulatives for two weeks prior to instruction. You can purchase manipulatives professionally designed for use in children's math classes from school supply stores,
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Equal sets contain identical elements. e.g. if A = {1,2,3} and B = {1,2,3} then A and B are equal  their elements are the same. Equivalent sets have identical numbers of elements
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( i¦kwiv·ə·lənt ′sets ) (mathematics) Sets which have the same cardinal number; sets whose elements can be put into onetoone correspondence
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Chromatids. During mitosis, microtubules grow from
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