2020.297 is equal to
2000+20+0.2+0.09+0.007
Expressing those values as the product of a single digit integer and an integer power of 10 we have:
[tex]\begin{gathered} 2000=2\cdot10^3 \\ 20=2\cdot10^1 \\ 0.2=2\cdot10^{-1} \\ 0.09=9\cdot10^{-2} \\ 0.007=7\cdot10^{-3} \end{gathered}[/tex]Re write the addition
[tex]2020.297=2\cdot10^3+2\cdot10^1+2\cdot10^{-1}+9\cdot10^{-2}+7\cdot10^{-3}[/tex]