The calculator is better at doing boring calculations than a human is, it solves most questions more quickly and accurately. This allows humans to spend more time doing what calculators can't...
The Human calculators favourite number is, 9. All numbers above 9 will always equal 9.
Examples:
11
1+1=2
11-2=9
36
3+6=9
36-9=27
2+7=9
and one more,
427
4+2+7=13
427-13=414
4+1+4=9
By following...
You have to be very quick and get most the answers right. Once, I got human calculator but it only lasted for a while. Here are some tips: Practise your time tables, division, addition, subtraction...