# Math Is Fun Forum

Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫  π  -¹ ² ³ °

You are not logged in.

## #1 2018-09-07 05:27:11

Xepemu
Guest

### 0.999... = 1 :: alternative version

Hi! Just wanted to add another version, same result ... math IS awesome!

1/9 = 0.111...
9 x 0.111... = 0.999...

but

9 x 1/9 = 9/9 = 1

=> 0.999... = 1

## #2 2018-09-07 19:42:21

Bob
Registered: 2010-06-20
Posts: 10,408

### Re: 0.999... = 1 :: alternative version

hi Xepemu

Welcome to the forum.

That's a neat method which seems to overcome the objections some folk have about infinite digits.

Bob

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

Offline

## #3 2019-12-15 18:07:58

Craigerb
Member
Registered: 2019-12-15
Posts: 1

### Re: 0.999... = 1 :: alternative version

If 0.999... (or 0.111...) were a number, you could multiply it by an integer,
but as it isn't, you can't.

Offline

## #4 2019-12-18 17:03:35

Agnishom
Real Member
From: Riemann Sphere
Registered: 2011-01-29
Posts: 24,974
Website

### Re: 0.999... = 1 :: alternative version

Hmm, what else could it be? Is it a kind of cookie? Is it a kind of lotion?

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
I'm not crazy, my mother had me tested.

Offline