NY Next Generation Math NY-1.OA.8

Math1st GradeWork with addition and subtraction equations.

The Standard

Determine the unknown whole number in an addition or subtraction equation with the unknown in all positions.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students find a missing whole number in addition or subtraction equations. They solve equations with the unknown before, between, or after the operation and on either side of the equal sign.
What Mastery Looks Like: The student solves 8 + □ = 11, □ - 3 = 5, and 6 + 6 = □. The student checks each value by making both sides equal.
Common Misconceptions: Students may assume the unknown always appears after the equal sign. They may use the visible numbers in order without considering which quantity is missing.
How to Assess It: Ask students to solve □ + 4 = 9, 10 - □ = 6, and 3 = 8 - □. Require a quick check for each value.

Lesson moves

Use counters and covered cups to model missing starts, changes, and totals in equations.
Ask students how the equal sign helps them check an unknown placed on the left side.
Play missing-number match with equation cards and number cards from 0 through 20.
Find missing quantities in classroom supply stories and record each relationship as an equation.

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$Preview of the NY-1.OA.8 printable worksheet$

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