Sand Table Small 320×306 Medium 640×611 Large 1024×978 Download Tiff Original 2400×2293 | (1.0 MB) Description A teacher helps students do math with a sand table, a predecessor to the abacus. Keywords abax, adding, chalkboard, classroom, group work, math problems, sand table, school, students working, teacher Galleries Boys and Girls, School Students Source: Ellsworth D. Foster ed. The American Educator (vol. 1) (Chicago, IL: Ralph Durham Company, 1921)
