Todd ran 8 laps around a 400-meter track on Monday, 4 laps on Tuesday, 8 laps on Wednesday, 4 laps on Thursday, and 8 laps on Friday. How many kilometers did he run?
Blank Space__________km
In total, Todd ran 8 + 4 + 8 + 4 + 8 = <<8+4+8+4+8=32>>32 laps.
Since one lap is 400 meters, Todd ran a total of 32 * 400 = <<32*400=12800>>12800 meters.
Converting meters to kilometers, he ran 12800 / 1000 = <<12800/1000=12.8>>12.8 kilometers. Answer: \boxed{12.8}.