Find 10 more than a two-digit number mentally

G1.NBT.13Grade 1Place ValueSource mission: Ten More, Ten Less & Tens Arithmetic

Adds ten to any two-digit number within 100 without counting, explaining that only the tens digit changes.

Progress & proof summary

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Evidence progress0 of 2 pieces collected

Current predictionNo prediction yet

Next reviewNot scheduled

Mastery projection: Not available yetWhat does this mean?

1.NBT.C.5

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EvidencePerformanceStatusNext step

Recall itRetrieve the idea without a cue Not startedCollect one observation

Explain the ideaDescribe why the response works Not startedCollect one observation

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Recall it

Adds ten to any two-digit number within 100 without counting, explaining that only the tens digit changes.

Estimated time: ~5 min