Knowledge atom
Add two two-digit numbers composing a ten
Adds two two-digit numbers when the ones exceed ten, regrouping to form a new ten.
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
- writes 615 for 47 + 28 — records each column sum without carrying
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
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