Electronic teaching device

摘要

An electronic teaching device (10) provides several mathematical activities including Place Value, Trade, Target, Solve It, Word Problems, Estimate, Select and Calculator. The Place Value activity enhances the understanding of numbers by pictorially displaying the place values. The Trade activity enhances the understanding of addition and subtraction by allowing the user to trade between the ones' place value and the tens' place value to properly perform a mathematical operation. The Target activity emphasizes logical reasoning and problem solving. The Solve It activity uses the place-value system to develop logical reasoning. The Word Problems activity tests the user's knowledge of basic mathematical terms and facts. The Estimate activity develops the ability to estimate answers to problems. The Select activity allows the user to recognize basic math operations.