text: 90% of 3.0 * 10^8\n\nThink of it like this\n\n(90/100) or (9/10)\n\n(9/10) * (3.0 * 10^8)\n\n(9 * 3.0 * 10^8)/10\n\n(27.0 * 10^8)/10\n\n(2.7 * 10^9)/10\n\n(2.7 * 10^9)/(1 * 10^1)\n\n(2.7/1) * ((10^9)/(10^1))\n\n2.7 * 10^8\n\nThe easiest way would to be to say .9 * 3 * 10^8, which would have given you 2.7 * 10^8