Knowledge atom
Explain why an addition or subtraction strategy works
Justifies a computation strategy using place value and the properties of operations.
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.NBT.B.9
Prerequisites
Common misconceptions
- believes only one order of operations is permitted because that is how it was taught
Required evidence
These evidence lanes define what would count toward this atom.
EvidencePerformanceStatusNext step
Explain the ideaDescribe why the response works 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.