Shapes and Partitioning into Equal Shares
Aligned to 2.G.A.3 — Common Core State Standards for Mathematics.
What this lesson teaches
You can name shapes by counting their sides and corners, like a pentagon has 5 sides. You can also split rectangles and circles into halves, thirds, or fourths, where every part is the same size. Three thirds put back together make one whole.
Worked examples
Example 1
Fold a strip of paper into 3 equal parts. Each part is one third. All three thirds together make the whole strip again.
Example 2
Cut a pizza into 4 equal slices. Each slice is one fourth, and four fourths make the whole pizza again.
Example 3
The same rectangle split into 2 parts gives halves; split into 4 it gives fourths. More equal parts means each part is smaller.
Practice questions
- How many sides does a hexagon have?
- Split a circle into 3 equal thirds.
- If a pizza is cut into fourths, how many fourths make the whole pizza?
Watch the lesson
Every lesson comes with a video taught in English and Spanish — the same video the QR code in the printed workbook opens.
▶ Watch this lessonEn español
Figuras Geométricas y División en Partes Iguales
Puedes identificar figuras contando sus lados y esquinas; por ejemplo, un pentágono tiene 5 lados. También puedes dividir rectángulos y círculos en mitades, tercios o cuartos, donde cada parte tiene el mismo tamaño. Tres tercios juntos forman un entero.
Ejemplo 1: Dobla una tira de papel en 3 partes iguales. Cada parte es un tercio. Los tres tercios juntos vuelven a formar la tira completa.
Ejemplo 2: Corta una pizza en 4 rebanadas iguales. Cada rebanada es un cuarto, y cuatro cuartos vuelven a formar la pizza entera.
Ejemplo 3: El mismo rectángulo dividido en 2 partes da mitades; dividido en 4 da cuartos. Entre más partes iguales, más pequeña es cada parte.
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