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This is a bit like it. Mental maths On Google Play and fdroid. https://mental-math.codeberg.page/
Is it a calculator note app? Not sure about open source but Soulver is excellent. Not sure if theres android
This is a bit like it. Mental maths On Google Play and fdroid. https://mental-math.codeberg.page/
Is it a calculator note app? Not sure about open source but Soulver is excellent. Not sure if theres android