The most common methods are:
Units-of-production method.
fractional distillation
Most frequently it is either snorted or smoked.
The most common method for murder is the use of firearms.
Electronic counting of platelets is the most common method.
There are many stimulants with effects that are substantially similar to methamphetamine. One of the most common is amphetamine. Others include methcathinone and phenmetrazine.
The most common method of poisoning is arsenic, because it is water soluble and tasteless.
The most common form of muscle force production is the concentric contraction force.
Walking.
Meth burners are not usually used for cooking but are used in the production of methamphetamine. Most of these are homemade from items found in the home.
The most common method is weaving. However in many places fabric construction is done by hand by using knitting.
The most common method of interest calculation used in financial institutions is compound interest.