A teaching tool to demonstrate addition and subtraction up to 20.
Supplied with a board on which to write. Write a number on the board and use the red and white beads to show the image of the corresponding number, sliding the remaining beads behind the white board.
Contents:
- Wooden abacus (82 cm)10 red and 10 white wooden beads (3.5 cm Ø)
- wooden whiteboard (35 x 14 cm)
