Below is shown an online simulator for an 8-bit full adder.
1 - Enter M and N as an 8-bit binary number using '0s' and '1s' only (each)
2 - Press on "Enter M and N"
3 - Press on "Add"
4 - Check answers

M = (8 bits only using 1's and 0's only)

N = (8 bits only using 1's and 0's only)

M_{7}

N_{7}

M_{6}

N_{6}

M_{5}

N_{5}

M_{4}

N_{4}

M_{3}

N_{3}

M_{2}

N_{2}

M_{1}

N_{1}

M_{0}

N_{0}

C_{7}

S_{7}

C_{6}

S_{6}

C_{5}

S_{5}

C_{4}

S_{4}

C_{3}

S_{3}

C_{2}

S_{2}

C_{1}

S_{1}

C_{0}

S_{0}

The answer to the sum is given by the digit C7 S7 S6 S5 S4 S3 S2 S1 S0 in this order.
M + N
In binary
+ =
In Decimal
+ =