01054nam a22002291  45000010008000000030008000080050017000160080041000330100017000740400027000910500019001180820013001371000019001502450072001692600052002413000035002935000197003285000151005255040030006766500049007067000069007553584822BD-DhUL20140821081159.0720107r19611960ohua     b    000 0 eng    a   61013900   aDLCcDLCdDLCdBD-DhUL00aQA135.5b.O755  a510bOSE1 aOsborn, Roger.10aExtending mathematics understandingc[by] Roger Osborn [and others]  aColumbus, Ohio :bC. E. Merrill Books , c1961.  aviii, 310 p. :bill. ;c24 cm.  aEarlier ed. copyright 1960 under the titles Toward improved understanding of mathematics, part I and Toward improved understanding of mathematics, part II, by M. V. DeVault, published in 1960.  aRevised in 1969, published separately in two volumes under the titles Understanding the number system and Extending understandings of mathematics.  aBibliography: p. 264-271. 0aMathematicsxStudy and teaching (Elementary)1 aDeVault, M. Vere.tToward improved understanding of mathematics.