Double digits number learning Montessori bead Set

This Montessori gold bead set includes
1) 9 tens bars
2) 20 units (you only need 9 units for work. the rest are for spare)
3) base for 9 units (It only have 9 holes not 10 holes. When there is 10 units. those units need to exchange to ten bead bar)
4) a green color ten face dice for units
5) a blue color ten face dice for tens

This Montessori math set is good for

- introduction of 2 digits number
- game for 2 digits number recognition
- game for 2 digits addition
- game for 2 digits subtraction