How many milligrams make one kilogram?

Conversion of kilogram to milligram:

It is known that the prefix "kilo'" stands for $\times {10}^3$

Thus, $1\mathrm{kg}=1000\mathrm{g}$

Again, it is known that the prefix “milli” stands for $\times {10}^{-3}$

Thus, $1\mathrm{g}=1000\mathrm{mg}$

Thus, $1$ kilogram $=1000\mathrm{g}\times 1000\mathrm{mg}=10,00,000\mathrm{mg}$

Therefore, $1$ kilogram$=10,00,000\mathrm{mg}$.