It's simple math, just figure it out.

An 1/8 of an ounce, is usually 3.5g's, so if you want to figure out a nik or dime, break it down. a 1/16, which is half an 1/8, is about, 2g's, so, then take the $10 and $5 down. 1g=$10, .5g=$5.

That is as simple as simple gets.