Bielefeld, 2016
The 2016 World Cup ran from 23 to 25 September in Bielefeld, Germany. Yuki Kimura of Japan won the combined standing with 668.64 points; Ono was second on 640.24; Jeonghee Lee of South Korea was third on 639.62, six tenths of a point behind him.
Ono's event placings that year were consistently high and never first: third in addition, second in multiplication, second in square roots, third in the surprise tasks scored as Most Versatile Calculator, and thirteenth in calendar calculations. The combined total is built from exactly that kind of spread, and it left him 28 points short of the title.
Paderborn, 2022
The ninth World Cup was held on the weekend of 16 July 2022 at the Heinz Nixdorf MuseumsForum in Paderborn, with 35 ranked competitors. Aaryan Shukla of India, who was 12, won the combination with 604.33. Ono was second on 559.45, ahead of Mohammad El Mir of Lebanon on 542.19.
This time he took titles. Ono won the addition of ten-digit numbers, and he won the Most Versatile Calculator award for the surprise tasks with 308.26 points. World Mental Calculation's report of the competition states that he also set a new world record for addition at the event.
What the events ask
The four standard disciplines are addition of ten-digit numbers, multiplication of eight-digit numbers, square roots of six-digit numbers and calendar calculation, where competitors name the weekday for dates drawn at random from the years 1600 to 2099. Everything is done mentally, with only the answers written.
The surprise tasks are withheld until the day and are designed to test improvisation rather than practised routines, which is why the Most Versatile Calculator title is treated as the measure of range. Ono has finished third and then first in that category across the two competitions.
Second place as a record
Two runner-up finishes six years apart is an unusual profile in a small sport with a fast-moving top. The champions of the editions covered by this file are Naofumi Ogasawara in 2012, Yuki Kimura in 2016, Tomohiro Iseda in 2018 and Aaryan Shukla in 2022 and 2024, four different names in five competitions.
Ono is the constant behind them, and his two silver-medal totals, 640.24 and 559.45, would have won several editions outright in other years. The winning score is a moving target that depends on who turns up and how the surprise tasks fall.
What is documented, and what is not
Documented by the World Cup's official results and by World Mental Calculation's report: both second places, the totals, the event-by-event placings, the addition and Most Versatile titles in 2022, and the reported addition world record.
Not documented in these sources: his age or date of birth, which is why this page carries no birth year; his home city or occupation; his results at any edition other than 2016 and 2022; and the exact figures of the addition record. In Japanese order his name is written Ono Tetsuya, which is the form the official 2022 results use.
| Person | Country | Milestone | Age / Stat |
|---|---|---|---|
| Tetsuya Ono | Japan | Runner-up at the 2016 and 2022 Mental Calculation World Cups | — |
| Stiaan Scheepers | South Africa | Junior Mental Calculation World Championship medals | — |
| Mishti Dharmesh Shah | India | Mental Calculation World Cup 2024 | — |
| Hua Wei Chan | Canada | Finishing second at the 2012 Mental Calculation World Cup | — |
| Naofumi Ogasawara | Japan | Winning the 2012 Mental Calculation World Cup | — |
What is documented — and what is not
✓ Documented
- Second overall at the 2016 World Cup in Bielefeld with 640.24
- Second overall at the 2022 World Cup in Paderborn with 559.45
- Won the addition event and Most Versatile Calculator (308.26) in 2022
- Placed second in multiplication and square roots in 2016
? Unverified, disputed or wrong
- No age, date of birth or home city in these sources
- The figures behind the reported addition world record are not published here
- No results recorded for editions other than 2016 and 2022
Questions people ask about Tetsuya Ono
What is Tetsuya Ono known for?
Finishing second at the Mental Calculation World Cup in both 2016 and 2022, and winning the addition and Most Versatile Calculator titles at the 2022 event.
How old is Tetsuya Ono?
No age or date of birth appears in the sources used here.
Who beat him?
Yuki Kimura of Japan in 2016, with 668.64 points, and Aaryan Shukla of India in 2022, with 604.33.
Did he set a world record?
World Mental Calculation's report of the 2022 competition states that he set a new world record for addition. The exact figures are not given in the sources used here.
What is the Most Versatile Calculator award?
It is scored on the surprise tasks, which are not published in advance and are designed to test improvisation.
How is his name written in Japanese order?
Ono Tetsuya, family name first, which is the form used in the official 2022 results.
Is Tetsuya Ono on Wikipedia?
No standalone English article is recorded for him in this file.
Where is Tetsuya Ono now?
The sources used here do not say.
Quick quiz: how well do you know Ono’s story?
Where did Tetsuya Ono finish at the 2016 and 2022 World Cups?
Which title did he win in 2022?
Who won the 2022 World Cup?
Sources
- Mental Calculation World Cup 2016 - Results — Mental Calculation World Cup (official), 2016
- Mental Calculation World Cup 2022 - Results — Mental Calculation World Cup (official), 2022
- Mental Calculation World Cup 2022: Results — World Mental Calculation, 2022-07-19
Checked by the Geniuses.club editorial team. Ages are given as of September 2026.
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