In Japan, there used to be a game for killing time...
using 4 numbers written in a train ticket(that no longer exist, so the game is now kind of disappearing...) and let them order in a way you want, and use +, -, ×, ÷, (), and make 10.
sometimes it is impossible to make 10, but you can easily go next random 4 numbers just with clicking the button on the right top.
and if you press the logo of "Make 10", you can see one of the solutions if there are.
and you can press "=10", to play with other number than 10
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