kilo is 1,000 times the base unit (tip for remembering: think money, 1k is 1,000)
centi is 1/100 of the base unit (tip for remembering: cent = 100)
micro is 1/1,000,000 of the base unit
nano is 1/1,000,000,000 of the base unit (tip for remembering: nano will have nine zeroes)
milli is 1/1,000 of the base unit
mega is 1,000,000 times the base unit