Abacus by Vanisha Venkat
https://youtube.com/shorts/zphnZ34Qr0Q?feature=share
Abacus – Speed Maths by Maneesh Venkat, Channapatna.
https://youtu.be/eSNxevd1Kd0?si=aGpIsLsL5oYQZuGK
Abacus – Speed Maths by Ganavi M R Aradhya, Maddur.
https://youtube.com/shorts/f9X4UHxC78A?si=LcSK27etJIeprY8Z