First, we must write the numbers before we add them, so let's "translate" them into numbers
[tex]\begin{gathered} 4\text{ thousands = 4.000} \\ \\ 11\text{ hundreds = 1.100} \end{gathered}[/tex]Now we have the numbers we can see what we are adding! So let's add them
[tex]4.000+1.100=5.100[/tex]Hence, 4 thousand + 11 hundreds is equal to 5100