Lesson Plan # 3
- (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: |
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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.
Note: You can enhance the classroom discussion by bringing in an
example of a square foot (a floor tile), a square inch (a postage
stamp) or just paper cutouts. Use them to find the area of things
in the classroom.
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