It can be done both technically and manually.
Questioning: inquisitive; eager for information. This presentation also, is prepared using the principles of math.
Those travelling via aeroplanes need to know the arrival and departure times of their flights, something which involves the use of mathematics to a very large extent.
To calculate the time difference, simply subtract Math skills can be pretty helpful! Mathematics is one of my favorite subject since in elementary and until now. In official works like banking, policy, school, college and universities mathematical calculations are done by technically.