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←MathGrade 1Equations

Knowledge atom

Find the unknown addend in a + ☐ = c

G1.EQ.07Grade 1EquationsSource mission: Missing Addends

Determines the missing second addend in an addition equation.

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Standards alignment

1.OA.D.8

Prerequisites

Common misconceptions

  • adds the two visible numbers (writes 21)

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Determines the missing second addend in an addition equation.

Estimated time: ~5 min

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