- (5 min) Mental Math
- Start with 8, add 12, then subtract 5 [15]
- What is one-fourth of 20? [5]
- Start with 6, multiply by 9, then subtract 4 [50]
- Divide 24 by 6, then add 6 [10]
- Start with 44, subtract 33, then multiply by 2 [22]

- (5 min) Review of selected problems from Homework # 2 (<= 3
problems)

- (10 min) Discuss rectangles, squares and rectangle area.
Rectangle definition: 4 sided figure with opposite sides parallel (=) and sides next to each other perpendicular(T).

Square definition: A rectangle with equal sizes. Area: the number of small unit squares in a big square or rectangle.

Area = length of one side X length of other side

Get students to help you do these examples:

Discuss units: Units are always "square somethings".

- (Remainder of class) In-class exercise

- Hand out homework to students as they successfully complete the in-class exercise.