To better prepare students for their future careers, a fifth-grade teacher designs and implements a lesson that uses spreadsheet software to graph functions.

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### Michael Dempsey

When understood and applied appropriately, mathematics is both beautiful and powerful. As a result, students are sometimes tempted to extend that power beyond appropriate limits. In teaching statistics at both the high school and college level, I have found that one of students' biggest struggles is applying their understanding of probability to make appropriate inferences.

### Joseph J. Walsh

Teachers share success stories and ideas that stimulate thinking about the effective use of technology in K–grade 6 classrooms. This month, Walsh reports on using such components as discussion boards, blogs, wiki lessons, and other computer-generated assignments in his methods course.

### Maria L. Hernandez and Nils Ahbel

luidMath™ (www.fluiditysoftware.com), a new mathematics software tool for Tablet devices, computers, and interactive whiteboards, can create a dynamic graph or table with a simple gesture and recognize written expressions as the mathematical relationship they intend. The software uses a stylus as its input device. By changing constant values in an equation to parameters, the user can create sliders instantly and see graphs and tables change dynamically. The CAS (Computer Algebra System) functionality allows simplification of algebraic expressions and solution of equations and can perform all the calculations from algebra through calculus. FluidMath uses standard mathematical notation to explore explicitly and implicitly defined functions, parametric functions, polar functions, and recursively defined functions.

### Rochelle Goldberg Kaplan and Sandra Alon

Professional development equips practitioners with skills to enhance student learning.

### Courtney Baker and Theresa Wills

Teachers share success stories and ideas that stimulate thinking about the effective use of technology in K–Grade 6 classrooms. This article explores the use of glogs.

### Christine A. Noddin

Share news about happenings in the field of elementary school math education, views on matters pertaining to teaching and learning mathematics in the early childhood or elementary school years, and reactions to previously published opinion pieces or articles.

### Kimberly D. Mueller

Three preservice teachers use virtual manipulatives during clinical interviews with students of elementary school age. The technology exposes students' problem-solving strategies and mathematical understanding, promoting just-in-time teaching about the target content. The process of completing and reflecting on the interviews contributed to growth of the preservice teachers' technological, as well as pedagogical content, knowledge.

### Katherine A. G. Phelps

Fourth- and fifth-grade learners can use differentiated number sets within CGI problem structures to add and subtract fractions with unlike denominators.

### Pamela Edwards Johnson, Melissa Campet, Kelsey Gaber, and Emma Zuidema

Three preservice teachers used virtual manipulatives during clinical interviews with students of elementary school age. The technology exposed students' problem-solving strategies and mathematical understanding, promoting just-in-time teaching about the target content. The process of completing and reflecting on the interviews contributed to growth of the preservice teachers' technological pedagogical content knowledge.