Public learning track
Equal Shares and Part-Size Relationships
1st Grade · Math · Open Global Math
6 lessons
Goal
Analyze equal and unequal partitions, verify equal shares across different orientations, and understand how increasing the number of shares decreases individual piece size.
Featured Diagrams
Equal Halves Versus Unequal Pieces
6 lessons
0 of 6 done
- 1Equal Halves Versus Unequal PiecesUp nextStart
- 2Checking If Two Pieces Are Equal HalvesPremiumNot started yet
- 3Recognizing Equal Fourths in Different OrientationsNot started yet
- 4More Pieces Mean Smaller SharesNot started yet
- 5Comparing Share Sizes with Fair Sharing StoriesNot started yet
- 6Showing That Four Fourths Make One WholeNot started yet
Standards Covered
- 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.
- 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.
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.