Knowledge atom
Solve take-from, start-unknown word problems within 20
Given an amount removed and what remains, finds the original amount.
Start practiceProgress & proof summary
LifecycleNot started
Evidence progress0 of 2 pieces collected
0%Current predictionNo prediction yet
Why?Next reviewNot scheduled
Mastery projection: Not available yetWhat does this mean?
Standards alignment
1.OA.A.1 1.OA.D.8
Prerequisites
Common misconceptions
- subtracts because the story mentions giving away — the single most common start-unknown error
Required evidence
These evidence lanes define what would count toward this atom.
EvidencePerformanceStatusNext step
Apply the ideaUse the idea in a new situation Not startedCollect one observation
Explain the ideaDescribe why the response works Not startedCollect one observation
Recent evidence
No evidence recorded yet
The first response record for this atom will appear here.