Knowledge atom
Recall all related differences within 20 from memory
Produces any subtraction fact with a minuend within 20 from memory.
Start practiceProgress & proof summary
LifecycleNot started
Evidence progress0 of 1 pieces collected
0%Current predictionNo prediction yet
Why?Next reviewNot scheduled
Mastery projection: Not available yetWhat does this mean?
Standards alignment
2.OA.B.2
Prerequisites
Common misconceptions
- fluent with addition but still counts back for subtraction
Required evidence
These evidence lanes define what would count toward this atom.
EvidencePerformanceStatusNext step
Recall itRetrieve the idea without a cue Not startedCollect one observation
Recent evidence
No evidence recorded yet
The first response record for this atom will appear here.