1. Cultivate mathematical concepts and computing ability: By learning addition and subtraction within 50 years, children can be helped to establish basic mathematical concepts.
2. Develop logical thinking and problem-solving ability: Learning addition and subtraction requires children to use logical thinking and reasoning ability to solve problems through calculation and analysis. This is helpful to cultivate logical thinking ability, improve problem-solving ability and flexibility of mathematical thinking.
Learning mathematics is not only to master calculation skills, but also to cultivate children's mathematical thinking, logical thinking and problem-solving ability.