Proportional Reasoning Using a Double Number Line

I am a mother, wife and math teacher. I currently teach at Moravian College in Bethlehem, PA and my favorite class to teach is statistics! This is my 27th year of teaching and I am a Desmos fellow and Desmos certified presenter. @mathteacher24 is my twitter handle and I blog at mathteacher24.blogspot.com. I have several tech related videos for stat and TI-NSpire at www.youtube.com/mathteacher24. Feel free to ask me questions about National Board Certification (renewed in 2015). I also enjoy singing, reading and staying fit using workouts from Beachbody (P90X3/TurboFire/21DFX).

Christine Lenghaus is a secondary school maths teacher who has taught in government and private schools in both regional and metropolitan Victoria, Australia. She currently teaches in the Technical and Further Education (TAFE) sector which is government run. Previously for the GMD she has presented two webinars on Visual strategies for teaching mathematics. She has presented at the annual Mathematical Association of Victoria (MAV) conference year for ten years (2007-2017); the Queensland Association of Mathematics Teachers conference in 2016 and in April 2018 she presented at the BCME conference in the UK at Warwick University. Last year she went interstate to South Australia to present and travels across the state of Victoria sharing her passion for teaching and learning maths when not in the classroom.