Knowledge atom
Subtract within 1000 without regrouping
Subtracts two three-digit numbers when no place requires decomposing.
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.NBT.B.7
Prerequisites
Common misconceptions
- misaligns places when the numbers have different digit counts
- reverses a column where the top digit is smaller — invisible here, exposed in NBT.24
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
Recent evidence
No evidence recorded yet
The first response record for this atom will appear here.