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Knowledge atom

Find the unknown in ☐ − b = c

G1.EQ.10Grade 1EquationsSource mission: Unknowns in Subtraction

Determines the missing starting amount in a subtraction equation.

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Standards alignment

1.OA.D.8

Prerequisites

Common misconceptions

  • subtracts (answers 2 for ☐ − 6 = 8) because the equation shows a minus sign

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EvidencePerformanceStatusNext step
Show the stepsCarry out the procedure accurately Not startedCollect one observation
Explain the ideaDescribe why the response works Not startedCollect one observation

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Determines the missing starting amount in a subtraction equation.

Estimated time: ~5 min

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