Dyscalculia is a specific and persistent difficulty in understanding numbers which can lead to a diverse range of difficulties with mathematics.  It will be unexpected in relation to age, level of education and experience and occurs across all ages and abilities.

BDA and SASC definition

• lack understanding of basic number facts
• have inefficient methods of calculating
• rely on counting using fingers or objects
• be unable to tell which of two numbers is larger
• have a difficulty identifying the value of digits
• struggle to estimate an amount
• have difficulty telling the time
• have difficulty seeing number patterns