# A deck of cards under 20s and 80 digits under 20s **URL:** \ **Category:** General Memory Chat\ **Created:** [April 1, 2019, 9:50am UTC](https://forum.artofmemory.com/t/a-deck-of-cards-under-20s-and-80-digits-under-20s/37235 "2019-04-01T09:50:18Z")\ **Posts on this page:** 1\ **Showing post:** 5
**Author:** ![bjoern.gumboldt](https://forum.artofmemory.com/user_avatar/forum.artofmemory.com/bjoern.gumboldt/32/16747_2.png) [@bjoern.gumboldt](https://forum.artofmemory.com/u/bjoern.gumboldt)\ **Post date:** [February 7, 2020, 7:47pm UTC](https://forum.artofmemory.com/t/a-deck-of-cards-under-20s-and-80-digits-under-20s/37235/5 "2020-02-07T19:47:01Z")
> [@sfep](#): > > As I know, each one of Mongolian mnemoteam uses PAO both for cards and numbers events. See here… > [@Speed Cards World Record 12.74 seconds - Shijir-Erdene Bat-Enkh](https://forum.artofmemory.com/t/speed-cards-world-record-12-74-seconds-shijir-erdene-bat-enkh/34576/9): > > [https://memory-sports.com/blog/interviews/interview-with-shijir-erdene-bat-enkh/](https://memory-sports.com/blog/interviews/interview-with-shijir-erdene-bat-enkh/) Memory-Sports : Please describe us your number system and why do you use it. Shijir : I use PAO (Person-Action-Object) in my number system. I use it because that is the first main system that our memory school teaches us and it feels comfortable and interesting to use. Memory-Sports : Please describe your card system, with which you broke the Junior world record in Speed Cards at the US Open 2016. Shijir : I us… As far as the 80 digits, just do the math for the deck of cards, where each card is equivalent to a double digit number… 3 cards in 17 locations gives you 51 plus one card left over. So, 6 digits times 17 locations is 102, which is more than 80. --- _[View the full topic](https://forum.artofmemory.com/t/a-deck-of-cards-under-20s-and-80-digits-under-20s/37235)._