Knowledge atom
Use think-addition to subtract within 20
Solves a subtraction within 20 by recalling the related addition fact.
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.C.6 1.OA.B.4 1.OA.IA.C.2
Prerequisites
Common misconceptions
- retrieves the wrong related fact (uses 6 + 14 rather than 6 + ☐ = 14)
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
Tell it apartDistinguish the target from a near miss Not startedCollect one observation
Recent evidence
No evidence recorded yet
The first response record for this atom will appear here.