Vietnamese Etymology tính + nhẩm. Pronunciation (Hà Nội) IPA(key): [tïŋ˧˦ ɲəm˧˩] (Huế) IPA(key): [tɨn˦˧˥ ɲəm˧˨] (Saigon) IPA(key): [tɨn˦˥ ɲəm˨˩˦] Verb tính nhẩm to do mental arithmetic, mental calculation, mental math Noun tính nhẩm mental arithmetic, mental calculation, mental mathWikiwand - on Seamless Wikipedia browsing. On steroids.