Public learning track
Halves, Fourths, and Quarters of Shapes and Sets
1st Grade · Math · Open Global Math
9 lessons
Goal
Partition two-dimensional shapes and discrete sets into two and four equal shares, name them using fractional language, and describe the whole.
Featured Diagrams
Distinguishing Equal Parts From Unequal Parts
9 lessons
0 of 9 done
- 1Distinguishing Equal Parts From Unequal PartsUp nextStart
- 2Partitioning Circles Into HalvesPremiumNot started yet
- 3Partitioning Rectangles Into HalvesNot started yet
- 4Partitioning Squares and Triangles Into HalvesNot started yet
- 5Partitioning Circles Into FourthsNot started yet
- 6Partitioning Rectangles Into FourthsNot started yet
- 7Finding Half of a Set of ObjectsNot started yet
- 8Sharing a Set into Four Equal Groups to Find One FourthNot started yet
- 9Building One Whole from Halves and FourthsNot started yet
Standards Covered
- OGM.2.FR.1Open Global Math Standards 2026™ · Math · Level 2 / Grade 1 (Age 6) · Grade 1Partition 2D shapes (circles, rectangles, squares) and discrete sets into two and four equal parts/shares; identify and name the parts as halves, fourths, or quarters (using phrases 'half of', 'fourth of', 'quarter of'), and describe the whole as two halves or four quarters.
- OGM.2.FR.2Open Global Math Standards 2026™ · Math · Level 2 / Grade 1 (Age 6) · Grade 1Understand that decomposing a whole into more equal shares creates smaller individual pieces, and distinguish valid equal parts from unequal divisions in visual examples and non-examples.
Curriculum Framework
1st Grade · Math · Open Global Math
1
9 lessons
Halves, Fourths, and Quarters of Shapes and Sets
Partition two-dimensional shapes and discrete sets into two and four equal shares, name them using fractional language, and describe the whole.
2
6 lessons
Equal Shares and Part-Size Relationships
Analyze equal and unequal partitions, verify equal shares across different orientations, and understand how increasing the number of shares decreases individual piece size.