Casio FX991ES Plus - Inputting recurring decimals? - The Student Room
How to convert from a decimal to a fraction using the calculator CASIO Fx- 991ES - YouTube
My calculator is giving me answers in fractions when using decimals and division. How do I change it back to giving me answers in whole numbers and decimals? - Quora
CASIO fx-991ZA PLUS: #15 Converting Decimals to Fractions - YouTube
How to Convert between Decimal and Fraction | Casio fx-115ES and fx-991ES Calculator - YouTube
Casio FX-991ES Plus Scientific Calculator User's Guide
Casio Calculator Fractions to Decimals (and back) - YouTube