## Monday, August 5, 2013

### Can you calculate the area of this irregular shape?

Team up with a partner and share the strategy that you used to solve this problem.

1. The first thing Tess and I did was took the shape and split it into 2, to make the equation easier. We worked out the area of the bigger shape and left the smaller shape to the side. As you can see the length of the big square is 15cm and the width is 10cm, so we know to calculate the area we have to multiply 15 and 10 witch is 150cm2. We had to find out the unknown width of the smaller square. It shows us through the arrows on the picture that the total width of the entire shape is 12cm and the width of the big shape is 10cm. We subtracted the two widths and came up with the answer 2cm. To find out the area of the smaller shape we multiply 8cm by 2cm witch equals 16cm. We now add the two areas together witch equals 166cm2.

2. Tess and I, all we did was took the shape and split it into 2 equal parts to make the equation easier. We worked out the area of the bigger shape and left the smaller shape to the side. As we could see the length of the big square is 15cm and the width is 10cm, so we know to calculate the area we have to multiply 15 and 10 witch is 150cm2. We had to find out the unknown width of the smaller square. It shows us through the arrows on the picture that the total width of the entire shape is 12cm and the width of the big shape is 10cm. We multiplied the two widths and came up with the answer 2cm.

3. Alexandria, Grace and I think that the answer is 332

We thing that because the first thing we did was split the 2 rectangles apart. Then, we multiplied 15 and 10 which added up to 150. Then we multiplied 150 and 2 which gave us 300. After that, we multiplied 8 and 2 and got 16, then we multiplied 16 and 2 which gave us 32. So we added 300 and 32 which equalled 332.

4. Serena

Well what I did first was I look at the height which was 15 cm and then I looked at the other side that I thought would look the same,but it was 8 cm. Then I looked at the base which was 12 cm equal to 8 cm and the one on top of it which I thought was goner be the same was 10 cm wide. So I add 10 and 2 to get 12 cm then I went 8 + something to get 15 cm , so I looked at how to get 7 so I went 3.5 + 3.5 makes 7 so I add 7 and 8 to equal 15 cm.

First thing I did was 15 cm multiple 10 cm equal 150 cm ,
then I did 8 cm multiple 2 cm equal 16 cm
after that , I add 150 cm and 16 cm which gave me 166 cm.

5. Jaylee and I think that the answer is 332 because.....

first we took the 2 rectangles apart. We then multiplied 15 with 10 and got the answer 150 . Then we multiplied 150 with 2 which gave us 300, Then we multiplied again 8 with 2 to make 16 . Then we multiplied 16 with 2 which was 32 then we added 300 and 32 together to make our final answer 332.

6. Eleva and I think the answer is 166

Because first we wrote 15x10 is 150cm2.So then we have 12 and 8 left so to get to 15 I wrote 8+7 is 15+one more is 16 so
now we add them all up so which is 166.