Student council treasurer at Millennium Science School. Mathematical genius among STEM-rich students. Specializes in abacus usage for problem-solving
Soroban evolved from Chinese suanpan imported to Japan in 14th century. Contains odd number of rods with beads: one five-bead and four one-bead rods. Each rod represents digit from 0 to 9 using bi-quinary coded decimal system. Features dot marking every third rod for unit rods and place value
Abacus consists of beads arranged in rods embedded in wooden frame. Current abacus has 17 rods with 5 beads each. Divided into upper (heaven beads) and lower (earth beads) parts
Abacus was used for calculations before electronic calculators. Originated from need for traveling merchants. Chinese Suanpan and Japanese Soroban are main types. Each rod represents values 0-9 with heaven beads (5) and earth beads (1)
Abacus was invented around 5000 years ago by Chinese people. First used by Mesopotamia for counting and arithmetic. Modern Abacus consists of nine vertical rods with sliding beads. Old version was shallow sand tray for counting
Top row has 1-2 beads, bottom row has 4 beads. Beads represent numbers 1-9 and decimal places. Start with all beads up in top row, down in bottom