Math Journal

In math class we had to answer a question and put our answer on our blog. The answer is, the perimeter of a triangle is 16cm. What is the missing measurement? Record your work on your journalblog. Write the measurement in cm and mm. One side of the triangle is 41mm and the other side is 5cm. I added 5cm and 41mm (I rounded 41 to 40) when I added them together I got 9cm and in mm it is 90mm. So there is still one side missing the I have 9cm or 90mm so to get 16 you have to added a number to 9cm or 90mm to get 16. I added 7cm to 9cm and got 16cm I also added 70mm to to 90mm to get 16cm.