Solve compare, smaller-unknown word problems within 20

G1.OA.20Grade 1OperationsSource mission: Compare Stories

Given a larger amount and the difference, finds the smaller amount — including inconsistent-language versions.

Progress & proof summary

LifecycleNot started

Evidence progress0 of 2 pieces collected

Current predictionNo prediction yet

Next reviewNot scheduled

Mastery projection: Not available yetWhat does this mean?

1.OA.A.1 1.OA.D.8

keyword-matches 'more' to addition — the hardest compare type and a high-value diagnostic

These evidence lanes define what would count toward this atom.

EvidencePerformanceStatusNext step

Apply the ideaUse the idea in a new situation Not startedCollect one observation

Explain the ideaDescribe why the response works Not startedCollect one observation

No evidence recorded yet

The first response record for this atom will appear here.

Recommended next step

Use one focused task to begin collecting evidence for this atom.

Apply the idea

Given a larger amount and the difference, finds the smaller amount — including inconsistent-language versions.

Estimated time: ~5 min