Knowledge atom
Solve one-step start-unknown word problems within 100
Finds the original amount given the change and the result, within 100.
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
2.OA.A.1
Prerequisites
Common misconceptions
- matches the operation to the story's action word rather than to the unknown's position
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.