Subtraction World Records  

Praveen Spirals subtracted two 80-digit numbers in one minute, 15.80 seconds using only his memory.

Praveen Spirals subtracted two 70-digit numbers in 55.31 seconds using only his memory.

Samarth Bhagyesh Patel mentally solved 10 random math problems correctly involving four-digit addition and subtraction in one minute, 41.20 seconds. He is seven years old and a champion at an international math competition held in Australia.