Presents five mathematics activities to celebrate the 100th Day of School. Lists the full set of activities that relate to mathematics, art, music, physical education, science, social studies and history, English, and creative writing. (ASK)

Having children create and solve their own story problems is a valuable activity to use for them to think carefully about and apply a concept to create and solve a problem. Describes using two books to help children learn about the concept of multiplication. (ASK)

Describes and shares one incident of a teacher's mathematics exploration in a professional development setting to exemplify the ideas of the Professional Standards for Teaching Mathematics. Focuses on the handshake problem which tries to find out how many handshakes will occur if 20 people shake hands with every other person. (ASK)

Active involvement and infusion of mathematics into familiar, everyday experiences are essential elements in challenging students to engage in true thinking. Presents an investigation on graphing that touches on all representations including tables of values, graphs, and verbal descriptions. (ASK)

Describes students' investigative work that resulted from playing the game Set in an attempt to show how such games can be used to develop mathematical reasoning. (ASK)

Compares methods of subtraction used by children and teachers. Suggests ways to encourage children to invent their own subtraction algorithms. (CCM)

Explores the meanings of millennium, century, and decade, and introduces the notion of millennial age as one's precise age on 1 January 2000. Asks students to estimate their millennial age and explores various other computation and estimation activities using the idea. (ASK)

Presents a problem that uses the design show and asks students to find a series of moves to take the design from the top-left corner of a piece of paper to the bottom-right corner while remaining in its original orientation. (ASK)

Presents answers to the problem appearing in the January, 1999 Problem Solvers section of this journal, which was a strategy game called "Take Two" in which two players played by placing seven chips in a row and removing one or two chips each turn. (ASK)

Explains a non-standard definition of an ellipse familiar to astronomers and workers in celestial mechanics but which is not usually given in undergraduate text books on mathematics. (MM)

Offers teaching suggestions for activities using the TI-73 graphing calculator in middle schools. Topics include the number line, data handling, and algebraic thinking. (MM)

Describes the use of the TI-73 calculator to support and enhance the teaching of mathematics with 9-11 year old students. Topics include equivalent fractions, algebra, and data handling. (MM)

Geometrical representations can help students generalize arithmetic to algebra. Includes several examples including triangle numbers and models of cubes. (Author/MM)

This brief article describes a few entertaining math "puzzles" that are easy to use with students at any grade level and with any operation. Not only do these puzzles help provide practice with facts and operations, they are also self-checking and may lead to some interesting big ideas in algebra.

This article describes a team-taught, activity-based format to teach students about measurement. Alternative assessment plays a crucial role in providing feedback to students throughout the unit. (Contains 9 figures.)