innumeracy

listen to the pronunciation of innumeracy
İngilizce - Türkçe
{i} hesap yapamama
{i} hesap bilmeme
İngilizce - İngilizce
Inability or unfamiliarity with mathematics or numbering systems

The man suffered from innumeracy stemming from a brain injury, and depended on his wife for all financial matters, no matter how trivial.