20/25 as a Decimal 0.8 20/25 = 0.8 = 80% Copy 20/25 = 0.8 = 80%. Simplified: 4/5. Formula Used20 ÷ 25 = 0.8 Frequently Asked Questions What is 20/25 as a decimal?0.8.What is 20/25 as a percentage?80%.