Mathematics Teacher (1993) Vol. 86, No. 2

  • Mathematics Teacher (1993) Vol. 86, No. 2

    FEBRUARY 1 993 Volume 86 Number 2 WHEN WAS THE LAST TIME YOUR ACHIEVEMENT TEST'S MATH CONTENT WAS UPDATED? { The abacus has been used for [housands of )ta.rs } The Chmtu ltT5ron da[tS back [0 1100 A D When it was first introduced in 12th century China, the abacus represented the very latest in "digital" calculating tec