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Math Mammoth Early Geometry covers geometry topics for grades 1-3 (according to the Common Core Standards). The first lessons in the book have to do with basic shapes. Children recognize and draw basic shapes (triangles, rectangles, squares, quadrilaterals, pentagons, hexagons, and cubes). They put several shapes together to form new ones, or divide an existing shape into new ones. We also study geometric patterns, right angles, have surprises with pentagons and hexagons, and make shapes in a tangram-like game. The students also learn about symmetry and mirror points. In the latter part of the book, the emphasis is on area and perimeter. Students find perimeters of polygons, including finding the perimeter when the side lengths are given, and finding an unknown side length when the perimeter is given. They learn about how to measure area in different kinds of square units, and relate area to the operations of multiplication and addition.
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