Question

the mass of an object is 100mg what is the objects mass in kg

Answer 1

1 kg = 1000 g
1 g = 1000 mg

100 mg
100 * 10^-3 g
0.1 g
0.1 * 10^-3 kg
10^-4 kg

Answer 2

Hello , 
100 mg = 0,000 1 kg .