1000100 = 2^6 × 1 + 2^5 × 0 + 2^4 × 0 + 2^3 × 0 + 2^2 × 1 + 2^1 × 0 + 2^0 × 0
= 2^6 + 2^2
= 64 + 4
= 68
1001 = 2^3 × 1 + 2^2 × 0 + 2^1 × 0 + 2^0 × 1
= 2^3 + 2^0
= 8 + 1
= 9
101010 = 2^5 × 1 + 2^4 × 0 +2^3 × 1 + 2^2 × 0 + 2^1 × 1 + 2^0 × 0
= 2^5 + 2^3 + 2^1
= 32 + 8 + 2
= 42
111000 = 2^5 × 1 + 2^4 × 1 + 2^3 × 1 + 2^2 × 0 + 2^1 × 0 + 2^0 × 0
= 2^5 + 2^4 + 2^3
= 32 + 16 + 8
= 56
GOOD LUCK!