This activity can help children with angles. Instead of measuring angles on paper, this can illustrate angles into a read life demonstration. This is active learning because as children close the door the angle changes and they can now measure it.
Convert Fractions to Decimals, Percents: Pinning for my kids.I wish a teacher had used something like this when I was in elementary school. Fractions, decimals and percents would have made SO much more sense to me!