1, let students further perceive the number within 100 in specific situations, and describe the relationship between two numbers within 100 with words such as "more", "less" and "less" to further cultivate students' sense of numbers.

2. Through activities, feel the close connection between mathematics and life, and cultivate estimation consciousness and rational reasoning ability.

3. Cultivate students' interest in learning mathematics and good habits of classmates' cooperation.

Teaching emphasis: The words "more", "less", "more" and "less" will be used to describe the relationship between two numbers in 100, so as to further cultivate students' sense of numbers.

Difficulties in teaching: understand and correctly use words such as "more", "less", "more" and "less" in combination with specific situations.