- AMI approved
- Unequalled beauty
- Precise control of error
- Exact isolation of one quality
- Perfect interrelations
-14%150 years Montessori discount! The discount is already applied.
This 2-compartment box with lid contains plastic chips,1 set with equations printed on them and 1 set with the answers to be used with the Subtraction Working Charts. All the equations and differences for the subtraction combinations 1–18 are included.
|Minimum age||6 years|
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