It is no secret that Quarter the Cross is one of my favourite tasks. I've written about it twice before: as a Day 1 activity and in connection with Fraction Talks. The original source is apparently T. Dekker & N. Querelle, 2002, Great Assessment Problems (www.fi.uu.nl/catch). It has proliferated in recent years, including with an active Twitter hashtag: #QuarterTheCross. … Continue reading #QuarterTheCross Card Sort