Knowledge atom
Represent a two-digit number with tens-and-ones models
Builds or draws any two-digit number within 120 using ten-rods and unit cubes.
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.NBT.B.2
Prerequisites
Common misconceptions
- builds 34 as 34 single cubes — technically the right amount but no place-value structure
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
The first response record for this atom will appear here.