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**GRADE 1**

- Recognize the:
- property of zero in addition, i.e.,
*a*+ 0 =*a* - property of zero in subtraction, i.e.,
*a*– 0 = a - commutative property of addition, i.e., a + b = b + a

- property of zero in addition, i.e.,
- Apply understanding of number properties in doing calculations

– Focusing on the Fundamentals of Math – A Teacher’s Guide, p.5

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#### A Guide to Effective Instruction in Mathematics Gr. 1-3 Number Sense and Numeration