Partial answer with "simple" operators: >! (10 + 10) / (10 + 10) = 1 >! (10 / 10) + (10 / 10) = 2 >! (10 + 10 + 10) / 10 = 3 >! ((10 / 10) + (10 / 10))² = 4 >! (10 * 10) / (10 + 10) = 5 >! ((10 + 10 + 10) / 10)! = 6 (thanks to [Kepotx][1]) >! 10 10 10 10 = 7 >! ((10 / 10) + (10 / 10))³ = 8 >! ((10 * 10) - 10) / 10 = 9 >! 10 + (10 - 10) * 10 = 10 [1]: https://puzzling.stackexchange.com/users/44790/kepotx