[Danizuni]

I need some help with chemistry. The problem is "convert 1156 pg into nanograms." The key that I have is this, when the number is in parenthesis it means its an exponent:
pico 1x10(-12)
nano 1x10(-9)
and then the base unit is a gram
My teacher uses a method which he calls "the map and railroad" and the most important part to him is that we have the railroad tracks correctly. Can someone help me with this?

[Vidya]

you can use this method
1g = 10^-12pg
and 1 g = 10^-9ng
now start with what is given to you
1156pg --> convert to g------> convert to pg
1156pg X 1g/10^-12pg   X 10^-9ng/ 1g

I hope this method matches with your teacher's map and rail road method.