Noun
innumeracy (countable and uncountable, plural innumeracies)
An ignorance of mathematics, or an inability to manipulate numbers
John Allen Paulos and others have asked our society to consider numeracy and innumeracy in a way closer to how we view literacy and illiteracy.
The man suffered from innumeracy stemming from a brain injury, and depended on his wife for all financial matters, no matter how trivial.