CCSS.Math.Content.1.G.A.3
The standard
Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.
Common Core State Standards for Mathematics · Geometry
What this standard means
Students need to split circles and rectangles into 2 or 4 equal parts and use the words halves, fourths, and quarters correctly. They also need to explain that 2 halves make one whole and 4 fourths or quarters make one whole.
Mastery looks like drawing or folding equal shares, naming each part, and comparing sizes when a whole is cut into more pieces. Students often get stuck making parts that are not equal, thinking any 4 pieces are fourths, or saying fourths are bigger than halves because 4 is larger than 2.
Ways to teach it
- Give students paper circles and rectangles to fold into halves and quarters, then have them label each share with crayon.
- Ask students to write or tell which is larger, half a sandwich or a quarter of the same sandwich, and explain why.
- Show four partitioned shapes and ask students to circle the ones that show equal halves or equal quarters.
- Connect to sharing one brownie rectangle fairly between 2 friends, then fairly between 4 friends, and compare the piece sizes.
Plan a lesson for CCSS.Math.Content.1.G.A.3
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