# A big controversy in math (0.999... = 1) **URL:** \ **Category:** Discussion\ **Created:** [April 23, 2026, 2:32am UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669 "2026-04-23T02:32:21Z")\ **Posts on this page:** 18\ **Page:** 5
**Author:** ![Guzman\_Tierno](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/guzman_tierno/32/6149_2.png) [@Guzman\_Tierno](https://cl.desmos.com/u/Guzman_Tierno)\ **Post date:** [May 23, 2026, 1:11pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/81 "2026-05-23T13:11:43Z")
thx, it was fun and the channel was starting to grow. It was fun to create the animations in Python to visualize math concepts but it required lots and lots of work … creating the script, creating the animations, making the voice overs, editing the video … it really takes a lot of work (and YouTube pays you almost nothing). Now I keep teaching math but I also produce math videos for an italian book editor, I have less freedom but at least I get paid. ---
**Author:** ![NTMDev](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/ntmdev/32/7141_2.png) [@NTMDev](https://cl.desmos.com/u/NTMDev)\ **Post date:** [May 23, 2026, 1:21pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/82 "2026-05-23T13:21:03Z")
I am subscribed btw 🙂 ---
**Author:** ![bhssingul](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/bhssingul/32/6761_2.png) [@bhssingul](https://cl.desmos.com/u/bhssingul)\ **Post date:** [May 23, 2026, 1:50pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/83 "2026-05-23T13:50:15Z")
ok i just saw this,but there is a nuber other than zero that is equal to zero , its like a backwards 3 and i think that 0.99999+(backwards 3)=1,so its not 1,but it is infinitely close,like how you never truly place something on a nuberling because you are always a atom or two off,so mathmatically:no,but if you are not pedantic,yes 0.9999 = 0 ---
**Author:** ![NTMDev](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/ntmdev/32/7141_2.png) [@NTMDev](https://cl.desmos.com/u/NTMDev)\ **Post date:** [May 23, 2026, 2:07pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/84 "2026-05-23T14:07:19Z")
i assume you meant 0.9999… = 1? Also its called epsilon btw > [@bhssingul](#): > > no,but if you are not pedantic,yes 0.9999 = 0 ---
**Author:** ![bhssingul](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/bhssingul/32/6761_2.png) [@bhssingul](https://cl.desmos.com/u/bhssingul)\ **Post date:** [May 23, 2026, 3:02pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/85 "2026-05-23T15:02:26Z")
yeah, for all non pedantically exact calculations,.9999…=1(but in pedanticness, it is not) ---
**Author:** ![Guzman\_Tierno](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/guzman_tierno/32/6149_2.png) [@Guzman\_Tierno](https://cl.desmos.com/u/Guzman_Tierno)\ **Post date:** [May 23, 2026, 3:07pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/86 "2026-05-23T15:07:55Z")
it is actually the inverse … if you wanna be pedantic they are exactly the same. ---
**Author:** ![port](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/port/32/9839_2.png) [@port](https://cl.desmos.com/u/port)\ **Post date:** [May 23, 2026, 4:47pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/87 "2026-05-23T16:47:33Z")
pretty sure a lot of people on cl are subbed, or maybe just us ---
**Author:** ![Guzman\_Tierno](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/guzman_tierno/32/6149_2.png) [@Guzman\_Tierno](https://cl.desmos.com/u/Guzman_Tierno)\ **Post date:** [May 24, 2026, 12:49pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/88 "2026-05-24T12:49:21Z")
btw, in my channel I also have a video where a do a 3.14 km wheelie while explaining the formulas to calculate π: [![](https://img.youtube.com/vi/-qtV_g7439g/maxresdefault.jpg "Un video un po' MATTO per il giorno di PI-GRECO | 3.14 Km su Una RUOTA") ](https://www.youtube.com/watch?v=-qtV_g7439g) Something a bit crazy I made 2 years ago. My record is actually longer: a 15.5 km wheelie. 🙂 ---
**Author:** ![NTMDev](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/ntmdev/32/7141_2.png) [@NTMDev](https://cl.desmos.com/u/NTMDev)\ **Post date:** [May 24, 2026, 12:57pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/89 "2026-05-24T12:57:54Z")
You are a crazy man. ---
**Author:** ![port](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/port/32/9839_2.png) [@port](https://cl.desmos.com/u/port)\ **Post date:** [May 24, 2026, 1:06pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/90 "2026-05-24T13:06:59Z")
that is just impressive at that point ---
**Author:** ![port](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/port/32/9839_2.png) [@port](https://cl.desmos.com/u/port)\ **Post date:** [May 26, 2026, 10:54pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/91 "2026-05-26T22:54:23Z")
do a mole wheelie for Mole Day (October 23) ---
**Author:** ![Guzman\_Tierno](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/guzman_tierno/32/6149_2.png) [@Guzman\_Tierno](https://cl.desmos.com/u/Guzman_Tierno)\ **Post date:** [May 26, 2026, 11:26pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/92 "2026-05-26T23:26:37Z")
it depends on the measure unit we use for lengths … if we measure length using the planck length, then Avogadro \* Plank Length= 6.0221408e23 \* 1.616255e−35 = 9 \* 10^12 m = 9 picometers therefore the wheelie woud be the millionth part of a millimiter … quite easy. ---
**Author:** ![port](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/port/32/9839_2.png) [@port](https://cl.desmos.com/u/port)\ **Post date:** [May 26, 2026, 11:37pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/93 "2026-05-26T23:37:23Z")
i meant to say kilometers… oops. ---
**Author:** ![NTMDev](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/ntmdev/32/7141_2.png) [@NTMDev](https://cl.desmos.com/u/NTMDev)\ **Post date:** [May 27, 2026, 12:40am UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/94 "2026-05-27T00:40:10Z")
Do tree(tree(tree(3))) miles wheelie ---
**Author:** ![port](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/port/32/9839_2.png) [@port](https://cl.desmos.com/u/port)\ **Post date:** [May 27, 2026, 12:42pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/95 "2026-05-27T12:42:59Z")
baby distance. do a tree(tree(tree(3))) quettameter wheelie ---
**Author:** ![NTMDev](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/ntmdev/32/7141_2.png) [@NTMDev](https://cl.desmos.com/u/NTMDev)\ **Post date:** [May 27, 2026, 1:29pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/96 "2026-05-27T13:29:48Z")
Maybe at that point he just doesn’t do a wheelie 🙂 ---
**Author:** ![Unknown](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/unknown/32/10869_2.png) [@Unknown](https://cl.desmos.com/u/Unknown)\ **Post date:** [September 26, 2026, 3:11pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/97 "2026-09-26T15:11:08Z")
0.999… = x Given 9.999… = 10x Multiplication Property of Equality 9 + 0.999… = 10x Additive Decomposition 9 + x = 10x Substitution 9 = 9x Subtraction Property of Equality 1 = x Division Property of Equality 0.999… = 1 Transitive Property ---
**Author:** ![Barrett\_Helmick](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/barrett_helmick/32/10989_2.png) [@Barrett\_Helmick](https://cl.desmos.com/u/Barrett_Helmick)\ **Post date:** [October 21, 2026, 7:20pm UTC](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669/98 "2026-10-21T19:20:53Z")
This is my take on the question: x=0.999… 10x=9.999… 10x-x=9.999…-0.999… 10y-y=9y 9x=9 1x=1 x=1 Thus, 0.999… is 1. [Previous page](https://cl.desmos.com/t/a-big-controversy-in-math-0-999-1/8669.md?page=4)