Floating point math Posted on Last updated on 24 July 2020 Funny little things 😁😁😁 2.6.5 :001 > puts 0.1 + 0.2 0.30000000000000004 => nil =))) Reference https://0.30000000000000004.com/ =))) Vì sao 0.1 + 0.1 + 0.1 không bằng 0.3