15/25 as a Decimal 0.6 15/25 = 0.6 = 60% Copy 15/25 = 0.6 = 60%. Simplified: 3/5. Formula Used15 ÷ 25 = 0.6 Frequently Asked Questions What is 15/25 as a decimal?0.6.What is 15/25 as a percentage?60%.