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Number Puzzle #32- Make 100 -

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Puzzle Image Can you arrange four 9's and a 1 and ONLY ONE basic arithmetic operator (+, -, *, or /) into a mathematical expression with a result equal to 100?

Note: All 5 numbers must be used in the expression (e.g. 99 + 1 is not valid).

Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?