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←MathGrade 1Operations

Knowledge atom

Count back to subtract within 20

G1.OA.04Grade 1OperationsSource mission: Count On & Count Back

Extends counting back to differences within 20, including crossing ten.

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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.OA.C.5 1.OA.C.6

Prerequisites

Common misconceptions

  • counts back a large amount instead of choosing a more efficient strategy

Required evidence

These evidence lanes define what would count toward this atom.

i
EvidencePerformanceStatusNext step
Show the stepsCarry out the procedure accurately Not startedCollect one observation
Tell it apartDistinguish the target from a near miss Not startedCollect one observation

Recent evidence

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Show the steps

Extends counting back to differences within 20, including crossing ten.

Estimated time: ~5 min

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