The writer has carried out contrast experiments based on current Abacus Mental Arithmetic class, which has 48 students / by By Mr. Wu Yanhua, Changchun Beilesi Kindergarten, Changchun, Jilin Province, China.
The writer has carried out contrast experiments based on current Abacus Mental Arithmetic class, which has 48 students / by By Mr. Wu Yanhua, Changchun Beilesi Kindergarten, Changchun, Jilin Province, China.