Hi, thank you for watching the video. 00 - 00 - (70-60) = -10 is correct not -F. Later it must be put in 2's compliment as it is a negative value, which was highlighted in the previous topics. So, -10 = 0001 0000 = 1110 1111 + 1 1111 0000 = F0 hope its cleared, Thank you.
