Five pages about right angles, the square corners of squares and rectangles. Page 1 starts with a worked example: the corner of a card fits each corner of a rectangle, so it has 4 square corners. Then students count the square corners in nine shapes, from big and small squares and turned rectangles to a rhombus, a kite and a triangle. On page 2 students circle the twelve shapes that have 4 square corners, every square and rectangle whatever its size, color or turn, and write how many they circled. Page 3 marks the square corners on the outside edge of twelve everyday things, a door, a book, a birdhouse, half a sandwich, a stop sign, and writes how many. Page 4 draws a square, a rectangle that is not a square and a turned square on dot paper and finishes a turned rectangle. Page 5 sorts ten lettered shapes into a table and asks five True or False questions about size, turn, color and number of sides.
Give every student an index card or a sticky note to use as a corner checker before page 1, and check the corners of a desk, a book and a window together. Show that the same card fits the corner of a big sheet of paper and a small sticky note: the corners are the same even when the shapes are not. Read the directions aloud for 1st graders, and do the first item of each page as a class.
Fold any piece of paper in half and in half again to make a corner checker, then hunt for square corners at home: a door, a picture frame, a cereal box, a tile. Look for corners that are not square too, like a slice of pizza or a roof, and things with no corners at all, like a plate or a clock.
This pack supports the following Common Core State Standards for Mathematics:
© Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
A 5-page right angles pack for 1st and 2nd grade. A right angle is a square corner: check corners with the corner of a card and count the square corners in shapes, circle the shapes that have 4 square corners, mark the square corners on a door, a book, a birdhouse and a stop sign, draw squares and rectangles on dot paper, then sort shapes and decide what does and does not change the corners. Every page comes in color and in black and white. Answer keys included.
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