Explore how the positions of decimal points in numbers affect their sums and differences.
[i]Answer these open ended questions on your own or with others to form deeper math connections.[/i]
What do you notice about the positions of the decimals in a sum or difference?
In finding [math]7.866+395.4[/math], Alex wrote the following calculation: [br][br][math]\phantom{+00000}7.866\\\underline{+\phantom{000}395.400}[/math][br][br]Why would Alex write extra zeros?