acalculia

(′ā·kal′kyü·lē·ə)

(medicine) A form of aphasia characterized by inability to do mathematical calculations.

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(ay-kal-KYOO-lee-uh)

noun
Inability or loss of the ability to perform arithmetic operations.

Etymology
New Latin, equivalent to a- + calcul- + -ia.

Usage
"We concluded that there was indeed a specialised brain circuit for numbers in the left parietal lobe, and that damage to this circuit had caused Mrs Gaddi's acalculia. If we were right, there should be other patients in whom brain damage has spared this area, leaving mathematical abilities intact, but has affected brain regions that support language, memory and reasoning." — Brian Butterworth, When brains don't count, The Independent - London, May 7, 1999.

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the inability to do simple arithmetic

IN BRIEF: Lack or loss of ability to do simple arithmetic tasks.