45/50 as a Decimal 0.9 45/50 = 0.9 = 90% Copy 45/50 = 0.9 = 90%. Simplified: 9/10. Formula Used45 ÷ 50 = 0.9 Frequently Asked Questions What is 45/50 as a decimal?0.9.What is 45/50 as a percentage?90%.