Mathematics Grade 1
Lesson Plans

Strand: OPERATIONS AND ALGEBRAIC THINKING (1.OA)

Represent and solve problems involving addition and subtraction within 20 (Standards 1-2, 5-6). Understand and apply properties of operations and the relationship between addition and subtraction (Standards 3-4). Work with addition and subtraction equations (Standards 7-8).

Standard 1.OA.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = ? - 3, 6 + 6 = ?

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