ABACUS

China: g80 8/22 31

contests between an electronic calculator and: g80 8/22 31; g80 10/22 30; g78 12/22 19

discussion: g71 11/22 17-20; g58 5/8 9-12

electronic abacus: g80 10/22 30

Japan: g79 12/8 31; g78 12/22 19; g76 4/8 30

use in American schools: g58 5/8 12