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![First steps with 991ES Plus Scientific calculator [2020] - YouTube](https://i.ytimg.com/vi/hyGf_JpCnMg/maxresdefault.jpg "First steps with 991ES Plus Scientific calculator [2020] - YouTube")
First steps with 991ES Plus Scientific calculator [2020] - YouTube
Which one is better, the Casio 991EX or the 991ES Plus? - Quora
