A collection of articles from the journals "Arithmetic Teacher" and "Teaching Children Mathematics" provide ideas for the instruction and use of teacher-made instructional aids. Guidelines used to select articles for this collection called for the articles to have a clear purpose and be related to a contemporary topic in the elementary school mathematics curriculum, to provide sufficient information and specifications to enable teachers to construct the aid, and to include activities using manipulative materials. The articles are grouped into categories as follows: (1) Computational Skills, which includes sets and number relationships, place value, computation-whole numbers, and rational numbers; (2) Geometry; (3) Measurement, which addresses metrics and English, money, time, angle; (4) Graphs and Charts; (5) Probability and Statistics; (6) Problem Solving; (7) Everyday Applications; (8) Estimation and Approximation; (9) Calculators and Computers, and (10) Multipurpose Aids. (ASK)