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←MathGrade 1Place Value

Knowledge atom

Find 10 less than a two-digit number mentally

G1.NBT.14Grade 1Place ValueSource mission: Ten More, Ten Less & Tens Arithmetic

Subtracts ten from any two-digit number within 100 without counting.

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Progress & 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.C.5

Prerequisites

Common misconceptions

  • confuses ten-less with one-less

Required evidence

These evidence lanes define what would count toward this atom.

i
EvidencePerformanceStatusNext step
Recall itRetrieve the idea without a cue Not startedCollect one observation
Tell it apartDistinguish the target from a near miss Not startedCollect one observation

Recent evidence

No evidence recorded yet

The first response record for this atom will appear here.

Recommended next step

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

Recall it

Subtracts ten from any two-digit number within 100 without counting.

Estimated time: ~5 min

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