Knowledge atom
Understand subtraction as an unknown-addend problem
Rewrites a subtraction as a missing-addend addition and solves it by thinking 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.B.4
Prerequisites
Common misconceptions
- treats subtraction and addition as unrelated operations with separate facts to memorize
Required evidence
These evidence lanes define what would count toward this atom.
EvidencePerformanceStatusNext step
Represent itShow the idea with a model or notation Not startedCollect one observation
Show the stepsCarry out the procedure accurately Not startedCollect one observation
Recent evidence
No evidence recorded yet
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