YouTubeThe record for being the fastest to write the answers of 100 single-digit sums with multiple integers was set by Tej Aarvik Reddy Kethu (born on January 2, 2019) of Pune, Maharashtra. He wrote the answers of 100 single-digit sums with multiple integers (each sum consisted of 4 positive and negative integers) on a sheet of paper in 4 minutes and 28 seconds with a pencil, using abacus method, at the age of 5 years, 11 months and 16 days