Knowledge atom
Subtract two-digit numbers decomposing a ten
Subtracts two two-digit numbers when the ones digit of the minuend is too small, regrouping a ten into ones.
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.5
Prerequisites
Common misconceptions
- subtracts the smaller ones digit from the larger regardless of position, answering 35 for 52 − 27 — the single most common multi-digit subtraction error
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
Represent itShow the idea with a model or notation Not startedCollect one observation
Recent evidence
No evidence recorded yet
The first response record for this atom will appear here.