Knowledge atom
Find the area of a rectilinear figure by decomposing it
Splits an L-shaped or composite figure into rectangles, finds each area, and sums them.
Start practiceProgress & proof summary
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Standards alignment
3.MD.C.7d
Prerequisites
Common misconceptions
- multiplies the two longest dimensions as if the figure were a rectangle
Required evidence
These evidence lanes define what would count toward this atom.
EvidencePerformanceStatusNext step
Show the stepsCarry out the procedure accurately Not startedCollect one observation
Explain the ideaDescribe why the response works Not startedCollect one observation
Recent evidence
No evidence recorded yet
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