##### Home > Teacher’s Guide > Page 5 >

**Grade 1 – Recognizing and Applying Understanding of Number Properties**

- 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

## Text Resources

This curated list of documents have been selected to help you gain a deeper understanding of the above selection from “Focusing on the Fundamentals of Math – A Teachers Guide”. Each link will take you directly to the relevant section within the document.

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