Maths Logic

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10




Similar Riddles

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

Car Number Riddle

Asked by Neha on 13 Mar 2021


With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

Asked by Neha on 13 Mar 2025

What does Alexander the Great and Winnie the Pooh have in common?

Asked by Neha on 17 Jul 2025


A deaf and mute man goes to the train station. Tickets for the train are 50 cents each. The man goes to the ticket booth and hands the man inside just a dollar. The man in the booth hands him two tickets.

How did the man in the booth know to give him two tickets without even looking at him?

deaf and mute man at train station riddle

Asked by Neha on 14 Mar 2021

Count the number of triangles in the given picture.

Find out triangles

Asked by Neha on 28 Mar 2025

What's the only room from which no one can enter or leave

Asked by Neha on 15 Apr 2024


In the figure, you can see nine stars. What you have to do is connect all of them by using just four line and without lifting your hand i.e. in a continuous flow.

Connect the Stars

Asked by Neha on 17 May 2021

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Who All Dies

Asked by Neha on 21 Mar 2021

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Asked by Neha on 20 Sep 2021


Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Asked by Neha on 07 Feb 2025

Hot Articles

Amazing Facts

Word ladder puzzle

The word ladder puzzle was invented by Lewis Carroll, author of Alice’s Adventures in Wonderland.