掐指头算 (掐指頭算) qiā zhǐtóu suàn

qiā zhǐtóu suàn set phrase to use thumb or fingers for counting
Domain: Idiom 成语 , Subdomain: , Concept:
Notes: (Guoyu '掐指一算'; Mathews 1931 '掐指頭算', p. 83)