5 x 5 = 25 right?
WRONG
Ah ha ha ha 
it’s 19 in hexadecimal.. 9 x 9 = 51 in hexadecimal..
Welcome to maths for computers 
This is the one thing i’ve had to work on this week.. the one thing i didn’t know already.. basically, we chuck 15 years of education in ‘normal’ maths out the window and start fresh with brand new maths 
For help with binary/hexadecimal etc.. i’d recommend you read wikipedia, use this tool to find correct answers, then get a sheet of paper and come up with the answer working backwards.. that’s what i did and i now understand it. Worst thing you can do is remember normal maths – forget it all.. do a memory dump..
