Lesson: Area of Parallelograms

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Lesson Objective

SWBAT find the area of parallelograms

Lesson Plan



Lesson Steps

Do Now

(8:30 – 8:40)/(10:00 –10:10) 

·         T displays 4 review problems

·         S complete problems independently on do now sheet

·         T walks around to check hw/help students with do now questions

·         T/S review problems together

·         S correct their work to reflect the correct answers

HW Check

·         T displays correct answers and work

·         S correct work with colored pencil  T walks around to review specific students work

·         T/S review 3 questions 

Mental Math

(8:40 – 8:50) /(10:10 – 10:20)

·         Law of Exponents

Mini Lesson

(8:50 – 9:25)/(10:20 – 10:55) 

·         T will define area as the number of squares that fit within a shape – and thus all answers should be in sq. units

o    Explain by relating to exponents – in this case we are multiplying two different dimensions together.  So it would be dimensions squared and this is why it’s called a two dimensional shape.

·         T/S will find area by placing squares into a rectangle and seeing how area is just the number of squares inside the shape and relating it to the formula.

·         T will demonstrate finding the area of a rectangle (noting that the formula is length x width)

·         S will find the area of a rectangle using formula

·         T will say that a rectangle is one type of parallelogram but also demonstrate that some parallelograms look like (a rhombus)

·         T will demonstrate finding the area of a parallelogram by

o    Clearly identifying the base

o    Clearly identifying the height

§  Explain the height of the shape is going to be straight up and down – just like when you measure yourself, you don’t lean over and then measure you want to stand as straight as possible

o    Display several different parallelograms to students in which the base, height and an additional leg’s measures are given.  Have students identify the base and the height in each example.

·         T will model finding the area of a parallelogram using the formula. 

·         T will demonstrate that the formula for a parallelogram and rectangle are the same by showing how a parallelogram and rectangle are similar (cut of the triangle on the end and move it to the other side to make it look like a rectangle and relate the height here).

·         S will find the area of a parallelogram using the formula

·         S will work on open-ended/mc questions to find the area of a given parallelogram


Skills Time

(9:35- 9:50) /(11:05-11:25)

·         Skills Time: same groups as Monday

o    Review matching equations


Lesson Resources

area parallelogram cw 3 17 09  
Area of Parallelograms HW  


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