Causes

They have not been taught "hands-on" math, affecting their ability to retain basic mathematics.

Inherited.

Environment.

Pre-mature birth.

Not one specific cause, but structure of brain is clearly damaged.

Class A, B, and C

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Class A (Developmental Dyscalculia): Inherited brain irregularities.
Class B (Post-lesion Dyscalculia): Brain damage, injury, stroke, not able to do basic math, even with assitance.
Class C (Math Anxiety): Caused by the environment.