untitled

Target

I can take my area model chopping to the next level.

Poll

Which type of area model is this?

• area model v1.0

• area model v2.0

• area model v3.0

Multiple Choice

Which equation best matches the area model?

• L x W = Area

• W x L = Area

• W + L = Area

L = length (how long)

W = width (how wide)

L goes first in L x W. If you switch it around, the total area is the same, BUT the area model would rotate (remember that commutative property?).

Enough warm up. Are you ready to turn up our math a little?

We are going step by step. Stay together. Try not to blink. 😜

Multiple Choice

What is the total area of this rectangle? It has a length of 12 units and a width of 10 units. You can use your multiplication chart to help you.

• 100 square units

• 120 square units

• 140 square units

Multiple Choice

What is the total area of this rectilinear shape?

• 150 square units

• 120 square units

• 140 square units

Multiple Choice

But.... what happens when a side is too big for us to solve easily?

• go ask someone else at your space

• chop it up into smaller rectangles

• say "ugh" and give up

We CHOP it up into not 1..2...3 small rectangles!

• We have 3 rectangles now

• A, B, and C

• Which small rectangle can we solve right away?

• We have to do some work on the next slide to figure out the other sides.

Hmm... what can we do?

• We already know rectangle C is 5 x 6 because...

• But we need to figure out....

Fancy, fun, easy trick with rectangles!

• What did you notice?

• Why does it work?

Next up: rectangle A

• We already know the width is 8.

• How can we find the length of rectangle A? It is not 25.. that is the length of A + B.

Let's start putting this together!

• A = 10 x 8 = ?

• B = 5 x 8 = ?

• C = 5 x 6 = ?

• If you are zooming, don't say the total area yet! Wait for a few more slides...

Almost there...!

80 + 40 + 30 = (don't say it yet, wait for the next slide)

Multiple Choice

The total area of this shape is...

• 80 square units

• 120 square units

• 150 square units

• 170 square units

Yay!

Now if we have time... try this out in seesaw!