Knowledge atom
Explain the multiples-of-ten strategy using place value
Justifies why 7 × 40 equals 7 × 4 tens, connecting the shortcut to quantity.
Start practiceProgress & proof summary
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Standards alignment
3.NBT.A.3 3.OA.B.5
Prerequisites
Common misconceptions
- treats 'add a zero' as an unexplained rule, which later breaks on 7 × 400 or decimals
Required evidence
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EvidencePerformanceStatusNext step
Explain the ideaDescribe why the response works Not startedCollect one observation
Recent evidence
No evidence recorded yet
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