Giessen, 2012
The Mental Calculation World Cup ran in Giessen, Germany, from 29 September to 1 October 2012. The official results table gives the winner as Naofumi Ogasawara of Japan with 828.15 points. Second place went to Hua Wei Chan, with 523.83.
The gap at the top was large, but second place in a small invitational field of the world's trained mental calculators is the strongest documented result of Chan's career. CBC News reported it the following March, noting simply that he had placed second at the World Cup held in Germany.
What competitors actually have to do
The World Cup is not a general arithmetic test. Competitors add ten ten-digit numbers, multiply two eight-digit numbers by each other, extract square roots from six-digit numbers and cube roots as well, and name the weekday for calendar dates drawn from anywhere between 1600 and 2100. A set of six surprise tasks is scored separately for versatility.
All of it is done without paper for working and without any device. The scoring combines speed and accuracy, and the standard rounds are supplemented by best-of-two formats. The 423 times 652 that CBC used to illustrate Chan's ability is, by the standards of that hall, a warm-up.
Edmonton or Malaysia
There is a discrepancy in the record that should be stated rather than smoothed. The official World Cup results table lists Hua Wei Chan under Malaysia. CBC News, reporting six months later, places him in Edmonton, Alberta.
Both can be true of the same person, and neither source explains the other. Competitors at international events are entered under a country of affiliation that need not be their country of residence. This page follows CBC on where he lives and the official table on how he was entered, and does not resolve the two into a single claim.
How small the discipline is
Competitive mental calculation is a narrow world. The World Cup is a single biennial meeting with a field measured in dozens rather than thousands, drawing people who have trained on the same handful of tasks, often for years. There is no professional circuit and very little money in it.
That scale cuts both ways when assessing a result. A second place is not second out of millions. It is second among the people who take the discipline seriously enough to travel to Germany and sit the tasks, which is the only meaningful comparison the sport offers.
What is documented and what is not
Documented: his second place at the Mental Calculation World Cup of 2012 with 523.83 points, the dates and venue of that competition, the disciplines contested, the winner Naofumi Ogasawara, his nickname as a human calculator, his residence in Edmonton per CBC, and his listing under Malaysia in the official results.
Not documented in these sources: his age or date of birth, his occupation, how he trains, how fast he works, and anything about him after March 2013. CBC's report carries no direct quotation from him and no biographical detail beyond Edmonton. No IQ figure appears anywhere in this file.
| 人物 | 国 | 節目 | 年齢 / 記録 |
|---|---|---|---|
| Chirag Rathi | インド | サハランプールの建設作業員の息子、8桁の計算を行う | 13歳 |
| Hua Wei Chan | カナダ | 2012年暗算世界選手権準優勝 | — |
| Stiaan Scheepers | 南アフリカ | ジュニア暗算世界選手権メダル獲得 | — |
| Mishti Dharmesh Shah | インド | 暗算世界選手権2024 | — |
| Naofumi Ogasawara | 日本 | 2012年暗算世界選手権優勝 | — |
What is documented — and what is not
✓ Documented
- Finished second at the 2012 Mental Calculation World Cup with 523.83 points (official results)
- The event ran in Giessen, Germany, from 29 September to 1 October 2012
- Naofumi Ogasawara of Japan won with 828.15
- CBC News profiled him in Edmonton on 9 March 2013
? Unverified, disputed or wrong
- The official results list him under Malaysia while CBC places him in Edmonton; neither source explains the other
- No age, occupation, training method or calculation speed appears in these sources
- CBC's report carries no direct quotation from him, and nothing documents him after 2013
Questions people ask about Hua Wei Chan
What is Hua Wei Chan known for?
Finishing second at the Mental Calculation World Cup held in Giessen, Germany, in 2012, with 523.83 points.
Where is Hua Wei Chan from?
CBC News places him in Edmonton, Alberta. The official World Cup results table lists him under Malaysia. This page reports both rather than choosing between them.
How old is Hua Wei Chan?
No age or date of birth appears in any source used for this page.
What does the Mental Calculation World Cup involve?
Adding ten ten-digit numbers, multiplying two eight-digit numbers, extracting square and cube roots, naming weekdays for dates between 1600 and 2100, and a set of six surprise tasks.
Who won the 2012 World Cup?
Naofumi Ogasawara of Japan, with 828.15 points.
What calculations can he do?
CBC reported that he performs addition, subtraction, multiplication and division mentally, using 423 times 652 as an illustration.
Where is Hua Wei Chan now?
Nothing in the sources used here documents anything about him after March 2013.
Is Hua Wei Chan on Wikipedia?
No standalone English Wikipedia article for him is recorded here; his result appears in tables of World Cup placings.
Quick quiz: how well do you know Chan’s story?
Where did Hua Wei Chan finish at the 2012 Mental Calculation World Cup?
Which city hosted the 2012 World Cup?
Which country does the official results table list him under?
Sources
- Meet the man they call the 'human calculator' — CBC News, 2013-03-09
- Mental Calculation World Cup 2012 Results — Mental Calculation World Cup (official), 2012
Checked by the Geniuses.club editorial team. Ages are given as of September 2026.
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