Express the monomial as a product of its factors.
Express 2 as a product of 1 · 2.
2r3s = 1 · 2 · r3 · s
Express r3 as a product of r · r · r
2r3s = 1 · 2 · r · r · r · s
The factor of 2r3s is 1 · 2 · r · r · r · s.