To estimate the product we have to round the factors and then use the associative rule of the product to evaluate the multiplication
[tex]\begin{gathered} 656\times106 \\ 700\times100=(7\times100)(100) \\ =7(100\times100) \\ =7(10000) \\ =70000 \end{gathered}[/tex]Therefore a good estimate of the product is 70000.
