Dyscalculia
According to the Learning Disabilities Association of America:
“Dyscalculia is a specific learning disability that affects a person’s ability to understand numbers and learn math facts. Individuals with this type of learning disability demonstrate impaired math calculation skills and difficulty understanding numbers and math facts.”
Nessy: Dyscalculia and Number Sense
Link to colorful page with easy-to-understand definitions, causes, treatment, links to research articles and two-minute video explaining the "whole to part" approach to number sense
ADDitude: Dyscalculia symptoms and treatment
PDF download with overview of definition, symptoms, diagnosis and treatment
Understood.org: Dyscalculia fact sheet
PDF with basic facts
Parenting Pod: The complete dyscalculia guide for parents
Link to article describing symptoms, causes, associated learning disabilities, treatment and resources
Link to Michigan-based nonprofit with comprehensive information and resources about dyscalculia