Use four 9s in any kind of operation so that they make 100: a challenging math puzzle

Anna OnishchenkoNews
A difficult mathematical puzzle. Source: freepik.com

In our daily lives, we often face challenges that force us to go beyond standard thinking. To deal with them in the best way possible, you need to train your mind regularly.

The following problem is the best way to make your brain work. It was shared by Quora.

"You have four 9s. What example can you think of to use with them to eventually get 100 using any math operation?

You can use addition, subtraction, division, multiplication, etc.

Math is not only about boring numbers and complicated formulas but also about fascinating puzzles that challenge our logic and ingenuity.

At first glance, this puzzle seems simple, but in fact it requires creative thinking and an unconventional approach. It is interesting not only for those who love math but also for anyone who appreciates logic games.

Solve such puzzles more often because they will not only give you a sense of triumph and satisfaction but also help you develop your logical abilities, data analysis skills, and spatial thinking. All of this will certainly help you solve problems and cope with challenges in everyday life.


You can leave out any math symbols between the nines if you need to. In this case, the number 99 will appear in your example.

If you have already solved this difficult math puzzle, congratulations! You have unique analytical and calculation skills. Now we suggest you check your answer.

The correct answer

One of the most common methods of solving this problem involves the use of addition and division.

99 + 9/9 = 99 + 1 = 100

First, we use two nines to make the number 99, and then we divide one nine by the other to get one.

Remember that division and multiplication operations in the example should always be done before addition and subtraction.

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