The phrase "are numerous methods of" is correct and usable in written English.
It can be used when discussing various techniques or approaches available for a particular task or subject.
Example: "In the field of education, there are numerous methods of teaching that cater to different learning styles."
Alternatives: "there are many ways to" or "various techniques for".
There are numerous methods of water purification, described below in order of effectiveness.
There are numerous methods of treatment for pilonidal abscess; however the best method in acute pilonidal abscess has remained controversial.
There are numerous methods of computing ET, but the Penman Monteith (PM) equation which provides the most reliable results for the estimates of reference evapotranspiration (ET0) in most of the regions and for varied weather condition, has been adopted by Food and Agriculture Organization (FAO).
There are numerous methods of quantifying agreement on content relevance.
16 There are numerous methods of utilizing 5-fluorouracil in the treatment of actinic keratoses.
There are numerous methods of performing gene expression experiments, including cDNA microarrays, oligonucleotide arrays and Affymetrix microarray chips.
There are numerous methods for the recovery of unburned carbon from CFA (Hwang et al. 2002).
There are numerous methods to compare a single pair of whole-genome sequences (Bray et al., 2003; Schwartz et al., 2003).
Although there are numerous methods for determining the antioxidant capacity of soluble natural extracts and insoluble food components [ 12], no perfect system is available to help us know the "true" antioxidant capacity of a complex medium [ 13, 14].
There are numerous methods for accessing the device manager in all versions of Windows.
Analysis of synergism is complex and there are numerous methods for determining true synergism.
