For most British people of my age learning up to 20^2 would be 2.8x larger as we had to learn times table to 12. https://blog.jgc.org/2010/06/duodecimal.html h

For most British people of my age learning up to 20^2 would be 2.8x larger as we had to learn times table to 12. https://blog.jgc.org/2010/06/duodecimal.html https://blog.jgc.org/2010/06/duodecimal.html