Teaching content: the new curriculum standard people's education edition, what is the floor area ratio of the first grade? Teaching objective: 1. Through practice, master one-to-one correspondence skillfully, and flexibly use one-to-one correspondence method to compare the number of objects. 2. Exercise students' ability to solve the same problem with multiple strategies. 3. Cultivate students' good inspection habits. Emphasis and difficulty: the number of objects can be compared flexibly by one-to-one correspondence method. Teaching process: 1. The teacher found that the students listened carefully in the last class. Now the teacher has given us two questions to test our classmates. Are you willing to accept the challenge? (Computer display) 1. Are they the same? Draw ∨ after the same number of groups. (1), () (2)()2. Draw "∨" after Duo. (1), () () (2), () () Import: Great! Students, today's practice class depends on who can be good at observing, discovering rules and improving their adaptability. (Clarify the requirements and purpose of this class) Design intention: Review the one-on-one method to compare the number of objects, and initially cultivate students' migration ability. Stimulate students' interest in learning. Second, it's good to practice in layers and strengthen the improvement! Are you willing to accept the teacher's challenge? (Computer display) 1. Connect the same number of wires. 2, draw more √, draw less O. () () () () 3. Draw "∨" at most and "O" at least.