xin.cat

Addition

Intuitive interface lets children play without interfering in their practice.A Proficiency Algorithm adapts the difficulty of the operations to the pl...

Multiplication

Intuitive interface lets children play without interfering in their practice.A Proficiency Algorithm adapts the difficulty of the operations to the pl...

Subtraction

Intuitive interface lets children play without interfering in their practice.A Proficiency Algorithm adapts the difficulty of the operations to the pl...