Number Sense (K – 3)

**Early Number Sense (Counting & Quantity):**

- Family Math Activities (K – Gr. 3) (University of Western Ontario)
- Developing Early Number Sense (Pre-school) (Feb.2009)
- Counting versus Place Value (NCTM, 2000)
- Problem solving in Kindergarten (NCTM, 2005)
- Odd & Even Numbers (Grade 1)
- How many spots? (NCTM, 2000)
- One Two Skip a Few (AIMS Literature Lesson)

**Place Value (upto 100):**

- Mathwire.com has an amazing collection of ideas & activities for celebrating the 100th day of school (http://mathwire.com/seasonal/100day.html)
- Exploring Ones, Tens and Hundreds (M. Burns, 2005)
- Decomposing Numbers: The 100th Day of School (NCTM, 2008)
- Celebrating the 100 days of school
- 100th Day of School: Suggested literature connections (2006)
- BaseTen_Interactive Tool
- Interactive Tool: place value

**Developing Operational Sense:**

- The foundation for computation (NCTM, 2003)
- Teaching Addition / Subtraction Basic Facts to 20
- Modeling Addition & Subtraction
- More than Flash Cards (NCTM, 2003)
- Teaching addends (C. Kamii) NCTM, 1998
- Addition & Subtraction Strategies (NCTM, 2004)
- Helping ESL Students develop computational fluency (NCTM, 2003)
- The NCTM Illuminations site presents a number of addition / subtraction units appropriate for Grades 1 – 3; including:

- Comparing Connecting Cubes at http://illuminations.nctm.org/LessonDetail.aspx?ID=U41.
- How Many More Fish? at http://illuminations.nctm.org/LessonDetail.aspx?ID=U51