Best way to convert measurements in the standard measurement system is to use the phrase "King Henry Died By Drinking Chocalote Milk"
K- Kilo
H- Hecto
D- Deca
B- Base (meter, liter, gram)
D- Deci
C- Centi
M- Milli
If you go up from the B, you move the decimal left, if you go down from the B, you move the decimal that many times to the right.
The picture will probably help explain better.
3) 10,640 g
5) idk which it needs to be converted to
7) 3,700 mg