is mental calculation something like mental math or something? if it is, then what i would do is find some simple math problems to start off and do it in mental calculations. then as u progress, u can get into difficult problems...
“His latest achievement came on December 10, 2007, where he mentally extracted the 13th root of a random 200-digit number in 70.2 seconds[1]. The so-called 'mathlete' produced the answer of 2,407,899,893,032,210 at London’s Science Museum."
I am still in high school as well, it was only a joke. Do you not watch family guy? Nevertheless, i conclude that you are still in elementary school, as your use of punctuation is nonexistant. Learn to spell, fool.
--- I am a servant of the Secret Fire, wielder of the Flame of Arnor.