00344nam a22000977a 450000500170000000800410001702000090005804000080006724501010007526000700017620200831110512.0200831b           ||||| |||| 00| 0 eng d  a4931  cCML  aThe Growth of Mathematical Ideas Grade K - 12.cThe National Council of Teachers of Mathematics.  aWashingtonbThe National Council of Teachers of Mathematicsc1959