Two years ago, Aden Sim Rong Jun achieved the record for writing down 520 digits for the square root of 10 from memory. On 25 Nov 2024 (age 13 years 11 months), he managed to set his second record by recalling 555 digits for the square root of 20. At the same time, his younger brother, Brayden Sim Rong Jie (10 years 6 months), was able to recall 600 digits for the square root of 15.
