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Well, it really depends what operations you want to allow, and whether you want to allow repetitions. In the case of repetitions, there are infinitely many trivial variations; for example, if you get one solution, you can repeatedly add and subtract the same number.

Also, it is difficult to ascertain whether a certain list of ways to make the number 100 contains "all the ways"; you would need to write a computer program to try out all possible combinations.

In any case, here are some possibilities, some with, some without repetition:

60 + 40

5 x 20

10 x 10

5! - 20 (the exclamation stands for the factorial function; factorial of 5 = 120)

5 x 10 + 5 x 10

Square root of (5 x 20) x 10

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10y ago
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Q: What are all the ways to make 100 using 60 40 20 10 5?
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