1011001(2) = 12^6 + 02^5 + 12^4 + 12^3 + 02^2 + 02^1 + 1*2^0 = 64 + 0 + 16 + 8 + 0 + 0 + 1 = 89(10)
137(8) = 18^2 + 38^1 + 7*8^0 = 64 + 24 + 7 = 95(10)
1F5(16) = 116^2 + 1516^1 + 5*16^0 = 256 + 240 + 5 = 501(10)
1011001(2) = 12^6 + 02^5 + 12^4 + 12^3 + 02^2 + 02^1 + 1*2^0 = 64 + 0 + 16 + 8 + 0 + 0 + 1 = 89(10)
137(8) = 18^2 + 38^1 + 7*8^0 = 64 + 24 + 7 = 95(10)
1F5(16) = 116^2 + 1516^1 + 5*16^0 = 256 + 240 + 5 = 501(10)