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

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

Asked by Neha on 15 May 2021


You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

Football World Cup 2014

Asked by Neha on 22 Aug 2021

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Asked by Neha on 05 Feb 2021


A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

Asked by Neha on 18 Oct 2021

I look at you, you look at me I raise my right, you raise your left. What am I?

Asked by Neha on 24 Apr 2023

Which of the below owl is odd one out?

Find the odd

Asked by Neha on 22 May 2021


A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

Asked by Neha on 05 Mar 2024

John went to meet his friend Jacob, but when he was about to reach the main gate, John notices that Jacob had a mighty dog who was fastened to the tree. The chain is long enough that it allows the dog to reach the main gate.

How can the John reach the main gate?

Dog and Visitor Riddle

Asked by Neha on 06 Apr 2021

While preparing the table for dinner, wife came up with an idea to tease his mathematician husband. She asked her husband to pick nine toothpicks and make ten without breaking any toothpick.

The husband was also smart and did it within seconds. How ?

Asked by Neha on 22 Dec 2020


There are forty elephants and they have forty-fore heads. How can this be possible?

Asked by Neha on 16 Apr 2024

Hot Articles

Amazing Facts

Crossword puzzles

In the 1920s, people feared that crossword puzzles would contribute to illiteracy.