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Presents a two-person nine-card game which illustrates and reinforces mathematical principles. Instructions in playing the game; Similarity between the nine-card game and ticktacktoe.

This article discusses various issues related to the law of sine and Benjamin Banneker, a self-taught mathematician, surveyor, and astronomer from Guinea. Banneker was taught how to read and write by his grandmother. Banneker learned learnt mathematics as far as double-position as well as surveying and astronomy from books he had been lent by his teacher and neighbors. He began publishing annual almanacs containing his astronomical observations and predictions. He kept his notes in journals, but only one of the journals is preserved. This journal served as his notebook for astronomical observations his diary, and his mathematics notebook. The article further elaborates the features of mathematical thinking of Banneker, and its significance for students.

Presents axioms and examples about the use of computer algebra systems (CAS) in schools. Improvement of students' understanding of mathematics; Functions of graphing calculators; Benefit of CAS for teachers of algebra; geometry and precalculus.

A letter to the editor related to errors in the sample problems published in the resource book "The Common Core Mathematics Standards: Transforming Practice Through Team Leadership" is presented.