Make 10 by combining four numbers and addition, subtraction, multiplication, and division. This is a game that you used to play with car license plates. It is a math quiz called Ten Puzzle, Make10, etc.
This is a game that improve your calculation and memorization skills.
In addition to 4 numbers, you can also play 10 puzzles with 3 numbers and 5 numbers. You can play a total of 2,490 puzzles, so you will never get bored.
Even if you can solve the puzzle, you can find the answer by watching at the ads. So, you won't get frustrated.