14) Notice that:
[tex]136.5=13.65\times10.[/tex]
Therefore:
[tex]136.5\div10=(13.65\times10)\div10.[/tex]
Now, we know that:
[tex](a\times b)\div b=a\text{.}[/tex]
Then:
[tex](13.65\times10)\div10=13.65.[/tex]
18) Notice that:
[tex]8100=0.81\times10^4\text{.}[/tex]
Therefore:
[tex]\begin{gathered} 8100\div10^4=(0.81\times10^4)\div10^4 \\ =0.81. \end{gathered}[/tex]
Answer:
[tex]\begin{gathered} 136.5\div10=13.65, \\ 8100\div10^4=0.81. \end{gathered}[/tex]
