Abacus ( Big )
Basic 4 – 9
The Abacus is a calculation machine. It is used mainly as a tool for simple and more complicated exercises in addition and subtraction. It helps children to understand that numbers exist out of different units like ones, tens, hundreds, thousands and ten thousands.
– 1 wooden frame fitted with 5 metal rods.
Each rod has 20 coloured counters installed
– A manual