Hi,
1 m² = 100 cm times 100 cm = 10,000 cm²
If there are 23 grass plants in 100 cm², then an entire m² contains:
[tex]23\cdot\dfrac{10,000\;cm^2}{100\;cm^2}=23\cdot 100=2,300\;grass\;plants.[/tex]
Green eyes.