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Death Rate is the actual rate of death where Crude Death Rate is a guess on the death rate.
Crude birth rate is how many live children are born. Crude death rate is how many people die. Crude death minus crude birth is the net gain (or loss) and is called the birth rate. It represents whether or not deceased people are "replaced".
you take the population and divide it by 3.14
The population decreases when the death rate is higher than the birthrate.
If the birth rate is higher than the death rate, the population increases. If the death rate is higher than the birth rate, the population decreases.