Reflections on the teaching of ordinal number within 5 in middle school mathematics; This time, I clapped my hands to review the number 1-5, and then talked about the small animals in forest travel. I arranged the headdresses of five small animals in a row and asked which small animals ranked first and which small animals ranked first. Distinguish the difference between ordinal number 5 and cardinal number 5. Finally, send the animals to the designated floor. The whole class used stories and games, animal pictures and headdresses as teaching AIDS, which fully mobilized the children's interest and enthusiasm. The atmosphere in the whole class became lively, and everyone scrambled to raise their hands. Even the most naughty Zhou's children spoke again and again. I will review the number 1~5 by clapping my hands first, which is a very simple link, because the children have no problem. But when it's Zhou's turn, he always makes mistakes and likes to shoot more by himself. I could have left him alone and continued my new class, but I think he should be made to understand that he should shoot more times and stop shooting after a few times. So, I invited a child to get up and teach him how to shoot, counting while shooting, and then stop when he counts. Then he still didn't get it right, and I asked him to follow me, and finally I understood. Later, Tian Yu didn't come to class for a long time, and the simple numbers 1-5 could not be counted when reviewing. I taught her again.