What is the difference between Dyscalculia, Dyspraxia and Dysgraphia?

Dyscalculia –

(or math disability) is a specific learning disability involving innate difficulty in learning or comprehending arithmetic. It is akin to dyslexia and includes difficulty in understanding numbers, learning how to manipulate numbers, learning maths facts, and a number of other related symptoms.

Dyspraxia –

is a condition that causes problems with movement and coordination. It is also known as “motor learning disability”. Somebody with dyspraxia finds it hard to carry out smooth and coordinated movements.

Dysgraphia –

is a deficiency in the ability to write primarily in terms of handwriting, but also in terms of coherence.
It occurs regardless of the ability to read and is not due to intellectual impairment. Dysgraphia is a transcription disability, meaning that it is a writing disorder associated with impaired handwriting, orthographic coding (orthography, the storing process of written words and processing the letters in those words), and finger sequencing (the movement of muscles required to write).