Kindergarten preschool mathematics exercise book Number enlightenment Figure calculation column problem 3-4-6 years old children's arithmetic Arithmetic book within 10 addition and subtraction Decomposition composition Small class Medium class Large class within 10 Addition and subtraction mouth composition Small class Medium class Large class within 10 addition and subtraction Mouth composition Small class Medium class Large class within 10 addition and subtraction Mouth composition Small class Medium class Large class within 10 addition and subtraction Mouth composition Small class