With the youngest students, it may be prudent to discuss chances as never, not likely, likely, and certain. For older students, you can represent probabilities as percentages or fractions, or even ranges of percentages, such as 0 percent, less than 50 percent, exactly 50
Kelly Hagan and Cheng-Yao Lin
S. Asli Özgün-Koca and Matt Enlow
In this month's Growing Problem Solvers, we focused on supporting students' understanding of congruence and similarity through rigid motions and transformations. Initial understandings of congruence and similarity begin in first grade as students work with shapes in different perspectives and orientations and reflect on similarities and differences.
Steve Ingrassia and Molly Rawding
Problems to Ponder provides 28 varied, classroom-ready mathematics problems that span grades PK-12, arranged in order of grade band. Links to the problem answers are available in this department.