**remember**, the formula for the area of a triangle.

I gave each student a 5 inch by 5 inch square. We used our rulers to measure five rows and five columns to show the area of our square.

*Last year, I used a 4 inch by 4 inch square. I am seriously struggling with which was the better alternative for this activity. A 5x5 square will yield an area of a triangle with a decimal. Since my kids were fairly comfortable with this, I went with it! :)*

This is

**100% review**for my fifth graders, but that was also

**100% the point**! I wanted my kids to see that finding the area of a triangle can be SUPER intimidating, but it is actually very similar to something that they are already experts at doing!

I had them lay their gridded square on their notebook. Then, we wrote the formula area = length x width, and calculated the area.

Then, I said, "But hey....aren't we talking about the area of a TRIANGLES today?! Errrr, that's embarrassing. Can we somehow make this square into a triangle?" <-----Unfortunately, I do say silly, sarcastic things like this!

They quickly discovered that by folding it in half, they could easily make a triangle.

They counted the squares and were able to calculate the area of the triangle without the use of a formula.

Then, I told them that I wanted to leave them alone for a while, and give them a chance to brainstorm a possible formula. The lightbulbs were seriously going off like crazy!

## No comments:

## Post a Comment