Introduce about the abacus: The abacus,also called a counting frame,is a calculating tool where beads are moved up and down and by feeling and looking at the beads,complex calculations are made. Calculations made by the abacus/soroban is a integration of mind and body.Abacus/soroban is a magical tool to make brain smarter. Soroban or an abacus is widely used in banks,businesses and at homes Encased in a strong durable frame and suspended with rods, the top beads represent fives and bottom beads represent body.Abah column represents a decimal point giving the total of a 17 digit number and beads are counted by sliding them on the rods. When one of the columns is set as the ones column,in this case the 4th column from the right,the next adjacent to the left becomes the tens column, then hundreds, thousands,ten thousands and so body.Aba decimal fraction can be displayed on the right side of the ones column as well. Abacus is also a very useful tool in general mathematics education because of its concrete visible display of numbers by beads that enable students to grasp of numbers, particularly in understanding place value. Digit number:17. Material:ABS. Size:L 26.2cm * W 6.2cm * H 1.2 cm . weight:134g. Package Included: 1x Abacus