NY Next Generation Math NY-1.OA.6.b

Math1st GradeAdd and subtract within 20.

The Standard

Fluently add and subtract within 10.

New York State Next Generation Mathematics Learning Standards

Teacher's field guide

What Students Need to Do: Students find sums and differences within 10 reasonably quickly. They use known facts, patterns, or efficient strategies and say or write the answer.
What Mastery Looks Like: The student answers a varied set of facts within 10 accurately and without counting every object. The student can briefly explain a useful strategy when asked.
Common Misconceptions: Students may confuse fluency with racing and guess to finish quickly. They may rely on counting all for every fact instead of using known relationships.
How to Assess It: Give eight mixed addition and subtraction facts within 10. Note accuracy, reasonable pace, and whether the student uses efficient thinking.

Lesson moves

Use two-color counters to build fact families within 10, then hide one part and name the missing amount.
Ask students to explain which fact within 10 they can use to solve a related subtraction fact.
Play a five-minute partner game matching addition facts, subtraction facts, and totals within 10.
Count classroom supplies added to or removed from small sets and state each new total quickly.

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