Three methods for using four-function, counting calculators for developing understanding of the meaning of square roots and operations on whole and rational numbers are described. (MP)

Two ideas to use as a bulletin board display as an activity center, or as worksheets emphasizing whole number concepts are described. (JT)

The concepts of number sense and numeration, operations, and whole-number computations and their importance are discussed. Activities cover developing concepts of operations, exploring patterns and relationships, and building an understanding of mathematical structure. (KR)

This game of strategy for two players is an adaptation of mastermind to a pencil-and-paper game. Rules and examples are given. (MP)

Described is an activity in which students develop their own number system. This activity allow students to examine the structure and history of number systems and to discover the power and respectable efficiency of the number system used today. (KR)

Task cards are discussed as a tool for learning. Examples of measurement and number activities that are appropriate for task cards are given. (MP)

This article gives two methods of resolving natural numbers into prime factors. Depending upon the number that is being resolved, one method may be better to use than the other. However, it is difficult to tell beforehand which is the better method to employ. Examples are given. (Author/MA)

Tests for divisibility in bases 2 through 10 are presented. Two strategies used by a group of fourth-year students are described. (MNS)

The focus of these worksheets is on whole-number numeration using resource materials such as newspapers, tables of contents, indexes, and almanacs. Notes for the teacher are included. (MNS)

Problems are discussed in which addition facts are presented using words instead of numbers. The letters are then replaced by numbers that will make the addition problems correct. (MP)

Mathematics activities and materials for teaching and reinforcing number concepts are presented. The activities, which rely primarily on number cards, are divided into the following sections: (1) sets less than ten; (2) the teen numbers; (3) sets and numerals to 100; (4) numeration; and (5) words that represent numbers (e.g., "one=1").…

An ancient Chinese method of calculating ages indirectly can provide interesting practice with number concepts. (SD)

Number bases other than ten can be introduced effectively by presenting fictional civilizations which use them. (SD)

A concrete approach to prime numbers is presented using rectangles and triangles to construct a building for each number so that each story represents a pair of factors and the triangular-shaped roof represents the number. (MP)

Three worksheets explore perfect, deficient, abundant, and amicable numbers by attaching mystical connotations to numbers and their divisors. (JT)