The 10 cheapest currencies in the world include Iranian Rial (₹1= 502), Vietnamese Dong (₹1= 298), Sierra Leonean Leone (₹1= 268), Lao/Laotian Kip (₹1= 263) and Indonesian Rupiah (₹1= 186). On number six is Uzbekistani Som (₹1= 151), followed by Guinean Franc (₹1= 103), Paraguayan Guarani (₹1= 90), Cambodian Riel (₹1= 47) and Ugandan Shilling (₹1= 45).