7th Grade · Geometry
Decompose
7.G.B.6
Definition
To break a complex geometric figure into two or more simpler shapes. Used to find area of composite figures by adding (or subtracting) the areas of the simpler parts.
Teach it
Where it is taught, with guided notes, practice, homework, an exit ticket and an interactive Teacher Deck.
Examples
- Split a figure into two rectangles: 32m2 + 15m2 = 47m2.
- Or use large rectangle minus missing piece for the same total.
Key rule
There is more than one way to decompose — choose the easiest for the figure.
Memory hook
Cut it into shapes you can measure.