http://indianachieverbookofrecords.com/meenal-mangal-performed-fastest-mental-math-calculation/

Fastest Mental Math Calculation

Meenal Mangal (11th August, 2003) student of Trendz Abacus, Kota (Rajasthan) performed Mental Math Calculation at Kota on June 28th 2016, successfully Breaking/Leveling Previous National Records thus Awarded with Fellowship of Record Achiever’s Club

With following Details

Operation Digit & Rows Previous National Record Fellowship Score
Time Previous Record Score Record’s Edition Year
Addition Subtraction 1d (4r) 1 Minute 43sums 2013 53 sums
Addition Subtraction 2d(2r) 1 Minute 43 sums 2013 56 sums
Addition Subtraction 3d(2r) 1 Minute 14 sums 2013 25 sums