Learn place value, addition and subtraction and visualise (large) numbers. Practise the principle of "˜borrowing' from the next column. The beads that are not used disappear behind the wooden partition. This abacus represents units, tens, hundreds, thousands and ten thousands. It contains 5 x 20 beads in 6 colours grouped in tens. -Contents:<BR>wooden holder with partition (18 x 15 x 6 cm)<BR>100 flat plastic beads in 6 colours (1.5 cm Ø)-