Knowledge atom
Subtract within 20 accurately across all fact types
Solves any subtraction with a minuend within 20 correctly, selecting among counting back, down-to-ten, and think-addition.
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
Prerequisites
Common misconceptions
- subtracts the smaller ones digit from the larger regardless of position when written vertically
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
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.