NY Next Generation Math NY-2.OA.3.b

Math2nd GradeWork with equal groups of objects to gain foundations for multiplication.

The Standard

Write an equation to express an even number as a sum of two equal addends.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students represent an even number as two equal addends. They write an addition equation that matches two equal groups.
What Mastery Looks Like: The student splits 14 into two groups of 7 and writes 14 = 7 + 7. The student recognizes that odd numbers cannot be written this way with whole-number addends.
Common Misconceptions: Students may split a number into any two addends instead of equal addends. They may write an equation whose two sides have different totals.
How to Assess It: Ask students to use counters to split 16 into equal groups and write a matching equation. Then ask whether 15 can be represented the same way.

Lesson moves

Fold 18 counters into two equal rows and write the matching equal-addends equation.
Ask students why 11 cannot be expressed as a sum of two equal whole numbers.
Play an equation match game pairing even-number cards with equal-addends equations.
Split an even number of snack bags equally between two tables and record the equation.

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