NY Next Generation Math NY-1.OA.6.a
The Standard
Add and subtract within 20. Use strategies such as: counting on, making ten, decomposing a number leading to a ten, using the relationship between addition and subtraction, and creating equivalent but easier or known sums.
New York State Next Generation Mathematics Learning Standards
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students add and subtract within 20 using flexible strategies. They count on, make a ten, decompose through ten, use related facts, or create an easier equivalent calculation.
What Mastery Looks Like
- A student solves 8 + 6 by making 10 and then adding 4 to get 14. The student solves 13 - 5 by subtracting 3 to reach 10 and then subtracting 2.
Common Misconceptions
- Students may apply a strategy mechanically without preserving the quantities or stop after reaching 10. They may use a known fact that is not equivalent to the original expression.
How to Assess It
- Ask students to solve 9 + 7 and 14 minus 6 with a strategy other than counting every object. Require a drawing or equation that shows the steps.
Lesson moves
Ways to Teach It
Use ten-frames and counters to make a ten or decompose through ten for sums and differences within 20.
Ask students which strategy fits 8 + 7 best and why.
Play strategy sort by matching within-20 expressions to counting, make-ten, decomposition, or related-fact examples.
Find changing totals in a snack or supply context and explain the chosen mental strategy.
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Printable NY-1.OA.6.a Worksheet
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