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000229663 001__ 229663
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000229663 010__ $$a   68056214 //r88
000229663 035__ $$a(OCoLC)ocm00002602
000229663 035__ $$a229663
000229663 040__ $$aDLC$$cDLC
000229663 049__ $$aISEA
000229663 0500_ $$aQA135.5$$b.O77 1968
000229663 082__ $$a372.7/2
000229663 1001_ $$aOsborn, Roger.
000229663 24510 $$aUnderstanding the number system$$c[by] Roger Osborn [and others].
000229663 260__ $$aColumbus, Ohio,$$bC. E. Merrill$$c[c1968]
000229663 300__ $$aviii, 189 p.$$c23 cm.
000229663 440_0 $$aMerrill's mathematics education series
000229663 500__ $$aRevision of Toward improved understanding of mathematics, part I, by M. V. DeVault, published in 1960, and of part of the combined revised ed. by R. Osborn and others, published in 1961 under the title Extending mathematics understanding.
000229663 504__ $$aBibliographical footnotes.
000229663 650_0 $$aMathematics$$xStudy and teaching (Elementary)
000229663 650_0 $$aArithmetic$$xFoundations.
000229663 85200 $$bgen$$hQA135.5$$i.O77$$i1968
000229663 909CO $$ooai:library.usi.edu:229663$$pGLOBAL_SET
000229663 980__ $$aBIB
000229663 980__ $$aBOOK
000229663 994__ $$aE0$$bISE