Creating a happy math class is the dream and pursuit of every math teacher. Happy classroom can help students master knowledge in a limited time and improve learning efficiency. Combined with my own teaching practice, I think the following aspects are worthy of teachers' attention: First, the introduction of situations should pay attention to interest, so as to stimulate students' interest, create a pleasant teaching situation, stimulate students' interest in learning, mobilize students' emotions and induce students' innovative thinking activities. Students in the lower grades of primary school are very interested in stories. In classroom teaching, teachers can describe stories in vivid language, and induce students to be in the story situation and actively participate in teaching activities. Creating story situations, asking questions in fun and thinking in doubt make students have a strong interest in learning and a strong desire to explore. For example, when I was teaching statistics, I created a situation in which a prince saved a princess. I asked the students that there was a beautiful princess who was imprisoned in a mysterious castle by a hateful witch one day. Do you want to save the princess with the prince? Children say "think". There are three castles (courseware display) ○ Castle, ⊿ Castle and □ Castle. Guess which castle the princess is being held in? Then play the animation to guide the children to make statistics on the graphics. The whole situation runs through the whole classroom, so that children can learn happily in interesting situations. The creation of this situation has stimulated students' desire to explore statistical knowledge, and students' enthusiasm for participation is very high. The classroom has become a place for students to conduct statistical competitions and an ocean of joy, and achieved good results. Second, the application of multimedia teaching, from abstract to concrete, from boring to interesting, from static to dynamic. In addition to these pleasant situations, multimedia can also be used to assist teaching, because multimedia integrates sound, light and animation, from abstract to concrete, from boring to interesting, from static to dynamic, which provides a good environment for students to better master knowledge. For example, I am teaching abdication subtraction of two-digit MINUS one. On 28th-3rd, the stick first appeared on the computer screen. How to subtract eight sticks from two bundles plus three? Students can do it themselves first, try how to reduce it, and then click the correct answer. The picture will be two bundles of three sticks and a bear. According to the student's method, the bear took apart a bundle of sticks and then. Bear said and did, adding appropriate sounds and music. In this process, students can operate by themselves and witness with their own eyes. The key to understanding the abdication subtraction of two digits MINUS one digit is to borrow one from the last one if it is not enough, and add one digit to ten and then subtract it. In this series of dynamic processes, students can repeatedly operate and grasp the key points, so as to draw correct conclusions, learn knowledge and complete teaching tasks. This link, with the help of multimedia color, sound and animation demonstration, can not only stimulate students' interest in learning, but also inspire students' thinking and improve teaching quality.