Question

determine a ordem de grandeza do número a seguir 2,45​

Answer 1

$\large\boxed{\begin{array}{l}\sf\acute E~a~pot\hat encia~de~10~mais~pr\acute oxima\\\sf de~determinado~n\acute umero\\\sf Forma~geral: a\cdot 10^b\\\sf se~a<5,5~a~ordem~da~grandeza~\acute e~10^b\\\sf se~a\geqslant5,5~a~ordem~da~grandeza~\acute e~10^{b+1}\end{array}}$

$\large\boxed{\begin{array}{l}\sf2,45=2,45\cdot10^0\\\sf como~2,45<5,5~a~ordem~da~grandeza\\\sf ser\acute a~10^{0+1}=10^1=10\end{array}}$