Solution
Given the expression below
[tex]\frac{23.8\times10^7}{4.2\times10^2}[/tex]
To estimate the expression, we apply the exponent rule
[tex]\begin{gathered} =\frac{23.8}{4.2}\times\frac{10^7}{10^2} \\ =5.66667\times10^{7-2} \\ =5.66667\times10^5 \\ =5.67\times10^5\text{ \lparen best estimate\rparen} \end{gathered}[/tex]
Hence, the best estimate is 5.67 x 10⁷
