Due to which of the following disabilities do learners have difficulty in understanding the concept of quantity and fractions?

Difficulty in understanding quantity, numbers and fractions is caused by dyscalculia, a learning disability in mathematics.

Dyslexia is a difficulty with reading, spelling and decoding words, not with numerical concepts.

Dyspraxia affects motor coordination and planning of movement, not mathematical reasoning.

Dysgraphia is a difficulty with writing, handwriting and putting thoughts on paper.

The prefix dys means impaired and calculia refers to calculation.

These specific learning disabilities are neurological and independent of general intelligence.