Identify Polygons by Sides and Corners
Trace the supplied boundary and count straight sides, checking that it is closed.
About 15 minutes, plus any extended practice
Open lesson 1Analyze Shapes and Equal-Area Partitions
Identify polygons, count rectangle tiles, and distinguish equal shares from equal-looking shapes.
Before you begin
- Name flat shapes and make halves and fourths.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Count Equal Squares in Rows and Columns
Draw the stated rows and columns of equal squares.
About 15 minutes, plus any extended practice
Open lesson 2Name Three Equal Shares as Thirds
Use the supplied equal-share description.
About 15 minutes, plus any extended practice
Open lesson 3Recognize Equal Area in Differently Shaped Shares
Use identical square grids so tile counts can show area.
About 15 minutes, plus any extended practice
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.
Topic references
- Common Core State Standards, mathematics: 2.G.A.1 — Identify polygons, count rectangle tiles, and distinguish equal shares from equal-looking shapes.
- Common Core State Standards, mathematics: 2.G.A.2 — Identify polygons, count rectangle tiles, and distinguish equal shares from equal-looking shapes.
- Common Core State Standards, mathematics: 2.G.A.3 — Identify polygons, count rectangle tiles, and distinguish equal shares from equal-looking shapes.
These references informed the topic selection. They do not certify complete standards alignment.