Knowledge atom
Solve for an unknown in any position within 100
Finds the unknown in an addition or subtraction equation within 100, whatever its position.
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 2.NBT.B.5
Prerequisites
Common misconceptions
- matches the operation to the sign in the equation rather than to the unknown's role
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
The first response record for this atom will appear here.