Question

Shown below is a problem Margaret solved and the steps she used to solve it. Margaret has entered this problem incorrectly. What misunderstandings does Margaret have? Show your work.
1/2 (64 + 5) - 0.2 (-20 +10)
1/2 (69) - 6
34.5 - 6
28.5


(paper due on 11/5/18

Answer 1

She has distributed the bracket incorrectly

$\frac{1}{2}$(64 + 5) - 0.2(- 20 + 10)

= $\frac{1}{2}$(69) - 0.2 (- 10)

=34.5 + 2

= 36.5