The National Council of Teachers of Mathematics (NCTM) recommended the use of calculators in the classroom in 1989. While calculators are more readily available in classrooms today than they were a few years ago, the recommendation is rarely followed in elementary grades. One of the reasons for this is a lack of appropriate classroom materials. This book provides tested lessons in which calculators play the role of tools helping to solve mathematical problems. Sections include: (1) Counting and Numbers; (2) Money; (3) Puzzles and Games; (4) Measuring; (5) Science; (6) Constructions; (7) Pythagorean Theorem; (8) Miscellaneous Activities; and (9) Learning How To Use a Calculator. (ASK)