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

**Grade 1 – Developing Proficiency with Operations**

- Add and subtract whole numbers to 20
- Add and subtract money amounts to 20¢, using coin manipulatives and drawings
- Recognize the inverse relationship between addition and subtraction (e.g., since 4 + 5 = 9, then 9 – 5 = 4) and apply this understanding 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 K-6, Vol 5, Teaching Basic Facts and Multidigit Computations

#### The Mathematical Territory Between Direct Modelling and Proficiency, What Works