What is the decimal equivalent of 10101010?

1 0 1 0 1 0 1 0

2^7 2^6 2^5 2^4 2^3 2^2 2^1 2^0

128 64 32 16 8 4 2 1

128 + 0 + 32 + 0 + 8 + 0 + 2 + 0 = 170