The 2024 standings
Aaryan Shukla of India won the combination with 819.84 points, repeating his 2022 victory and setting the highest winning total since 2012. Kaloyan Geshev of Bulgaria was second on 532.86. Chiba was third on 455.75.
The gap at the top was extraordinary: Shukla scored more than the next two competitors' totals separated. Against that, a podium finish was the best available result for everyone else in the hall, and Chiba took it.
The addition round
Addition at the World Cup means summing ten-digit numbers under time pressure, in rounds scored on correct answers. Chiba's two rounds produced 11 and 20 points. The second of those, as World Mental Calculation put it, was twenty questions solved with zero errors.
The two sources differ on where that placed him. The competition's official results table ranks him fourth in the addition discipline; World Mental Calculation's report of the same event says he placed third in it. This page records both rather than choosing, because the discrepancy is in the published record and not in the arithmetic.
Across the other events
Chiba was third in multiplication of eight-digit numbers, with 7 and 15 across the two rounds, and fourth in square roots of six-digit numbers with 8 and 20. He was third in the surprise tasks, scored as Most Versatile Calculator, with 282.39 points, and eighteenth in calendar calculations with 13 and 20.
That is the shape of a strong all-round competitor with one weak discipline. The combined title rewards exactly this breadth, and third place overall came from placing near the top of four events rather than winning any of them.
What the tenth World Cup involved
Nine events were contested: the four standard disciplines of calendar calculation, addition, multiplication and square roots, plus five surprise challenges that were not published in advance and required improvisation. Those included fractions, roots and powers, and other composite arithmetic.
Several world records fell that weekend. Shukla set a new mark for addition, ten ten-digit problems in 78.08 seconds, and another for square roots at 33.78 seconds; Geshev improved his own division record to 32.38 seconds. The competition is small, thirty-five people from sixteen countries, but the records it produces are the sport's official ones.
What is documented, and what is not
Documented: the date and venue, the size of the field, his third place and total of 455.75, his per-event scores and placings, and the zero-error addition round, from the World Cup's official results and World Mental Calculation's report.
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; the Japanese characters for his name; and any result before or after 2024. He does not appear in the top three of the earlier editions consulted for this page.
| Person | Country | Milestone | Age / Stat |
|---|---|---|---|
| Hiko Chiba | Japan | Third place at the 2024 Mental Calculation World Cup | — |
| 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
- Third overall at the 2024 Mental Calculation World Cup with 455.75 points
- Event held in Paderborn on 14 September 2024, with 35 competitors from 16 countries
- Solved 20 addition questions with zero errors in one round
- Third in multiplication and in Most Versatile Calculator (282.39)
? Unverified, disputed or wrong
- The official table and World Mental Calculation disagree on his addition placing, fourth or third
- No age, date of birth or home city in these sources
- No results recorded for any other edition
Questions people ask about Hiko Chiba
What did Hiko Chiba achieve?
Third place overall at the 2024 Mental Calculation World Cup in Paderborn, with 455.75 points, including a round of 20 addition questions solved without an error.
How old is Hiko Chiba?
No age or date of birth appears in the sources used here.
Did he win any event?
No. He was third in multiplication and in the Most Versatile Calculator category, and third or fourth in addition depending on the source.
Why do the sources disagree about addition?
The official results table ranks him fourth in the discipline; World Mental Calculation's report of the same competition says third. Both are recorded here.
Who won the 2024 World Cup?
Aaryan Shukla of India, with 819.84 points, the highest winning total since 2012.
How large is the competition?
Thirty-five competitors from sixteen countries took part in 2024.
Is Hiko Chiba on Wikipedia?
No standalone English article is recorded for him in this file.
Where is Hiko Chiba now?
The sources used here do not say.
Quick quiz: how well do you know Chiba’s story?
Where did Hiko Chiba finish at the 2024 World Cup?
How many addition questions did he solve without an error?
Who won the competition that year?
Sources
- Mental Calculation World Cup 2024 - Results — Mental Calculation World Cup (official), 2024
- Mental Calculation World Cup 2024: Results — World Mental Calculation, 2024-09-20
Checked by the Geniuses.club editorial team. Ages are given as of September 2026.
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