Geometry (Grade 2)
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Common Core For Grade 2
Videos, examples, lessons, songs, and solutions to help Grade 2 students learn to partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape.
Common Core: 2.G.3
Suggested Learning Target
- I can partition (divide) a circle and rectangle into two, three, or four equal parts.
- I can describe the equal shares with words (e.g., halves, thirds, fourths).
- I can describe a whole by the number of equal parts (e.g., two halves make a whole).
- I can explain and give examples to show that halves, thirds, and fourths of an identical whole need not be the same shape (e.g., half of a rectangle can be shown horizontally or vertically).
- I can model using concrete materials (e.g., paper folding, geoboards, fraction manipulatives) to create equal shares
2.G.3 - Halves
This video explains how to partition a rectangle or circle into 2 equal shares, and defines why we call each share a half. It further explains that 2 halves make 1 whole.
2.G.3 - Thirds
This video explains how to partition a rectangle or circle into 3 equal shares, and defines why we call each share a third. It further explains that 3 thirds make 1 whole.
2.G.3 - Fourths
This video explains how to partition a rectangle or circle into 4 equal shares, and defines why we call each share a fourth. It further explains that 4 fourths make 1 whole.
2.G.3 - Equal Shares Do Not Need to Be Same Shapes
This video takes on the Common Core State Standards for Mathematics and shows why equal shares do not need to be the same shape (2.G.3). This builds the foundation for students to see how equal does not need to look the same, a key understanding necessary for equivalent fractions.
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