Aug 6 (Reuters) - S&P futures jumped on Friday as the Labor Department"s jobs report showed the U.S. economy added 943,000 jobs in July, higher than economists" expectation of 870,000. At 8:34 a.m. ET, Dow e-minis were up 79 points, or 0.23%, and S&P 500 e-minis were up 5.5 points, or 0.12%. Nasdaq 100 e-minis were down 35.5 points, or 0.23%.