Math in the Fourth Grade By John Griffin Cook, Elijah F. Harris and Jack Lille Yerington

In math the fourth grade is learning about geometry. One of the things that helps us is the geoboards. When we use geoboards we have to find out the area of shapes. We find the area of shapes by using square units. We are not only using geoboards, we’re using symmetry. Kids have to find out the area of a shape by taking different triangles and putting them together to see if they add up to a full square. We’re decomposing shapes in order to find out how many squares are in their area. We are also learning about angles like the acute angle, the right angle, and the obtuse angle. A trick to find out how to make an acute, obtuse, or right angle is to point at yourself and say “I’m cute” for an acute angle , to point at your friend and say “You’re obtuse”, and to point at the ceiling for a right angle.

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About Mark Silberberg

Mark is thrilled to be a member of LREI's vibrant learning community and is inspired each day by students and colleagues alike. Mark began his formal adult life in schools as a teacher of physics, chemistry, English and an experiential business simulation class in the public schools where he also worked as a school administrator and technology coordinator. For the ten years prior to coming to LREI, Mark was a co-founder and co-director of a progressive K-12 public charter school. When not immersed in things LREI, Mark enjoys spending time with his family and completing sundry home repair projects. He is an avid soccer player and skier and wishes he had more time to play the guitar and bass.

One thought on “Math in the Fourth Grade By John Griffin Cook, Elijah F. Harris and Jack Lille Yerington

  1. I’ve never heard of that trick to tell the difference between an acute and an obtuse angle. What happens if your friend gets mad at you for pointing at them and calling them obtuse?

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