Mathematics is a very useful subject, which affects people's comprehensive generalization ability, logical thinking ability, associative analogy ability, modeling ability, information utilization ability, decision-making response ability, spatial imagination ability, numerical processing ability and so on. Laying a foundation in class, promoting development after class and combining inside and outside class will certainly develop students' intelligence, improve their learning ability, develop their mathematical literacy and promote the overall improvement of teaching quality. So how to make students learn math easily and happily? First, we should cultivate children's interest in learning mathematics. As the saying goes, "Interest is the best teacher". Only when students are interested in learning mathematics can they have initiative and enthusiasm. With initiative and enthusiasm, they will think more, do more, think positively and overcome learning difficulties. From "willing to think" to "good at thinking" is a process of continuous development and improvement of students' intelligence. However, the cultivation of students' interest is largely related to teachers' teaching attitude. Students are infected by the spirit that teachers love the cause of mathematics and can engage in teaching with full enthusiasm. Students like to learn that course and are often associated with teachers who like and respect it. Of course, stimulating students' interest in learning mathematics is a long-term and multifaceted work. I think we can start from the following aspects: (1), teachers should be as lively and interesting as possible; (2) The teaching methods are rich and varied, and students are often involved in teaching activities, and cooperative inquiry is often adopted; (3) praise more and criticize less; Especially for poor students, we should enthusiastically encourage them to make progress and affirm their achievements in time; (4) Let students often see their progress; (5) Encourage students to ask questions and try to think and solve problems by themselves; (6) Appropriate use of various methods to mobilize the enthusiasm of students, so that students can do more hands-on and practice. Second, teaching methods should be diversified 1. It is necessary to use inquiry teaching more. Inquiry teaching is a very important teaching method for children. This teaching method can make students use their eyes, mouths and brains, and guide them to find, analyze and solve problems themselves. This method is just like the teacher paving the road and bridging the bridge, and the students walk to their destination by themselves. 2. Other methods should also be used appropriately according to the characteristics of teaching materials and the specific conditions of students. Third, classroom exercises must be completed in time. First of all, it must be done in class, so that students can think seriously, do their homework seriously, strike while the iron is hot and improve the efficiency of practice. At the same time, finishing homework in class also reduces students' learning burden. Practice cannot simply pursue quantity, but should pay attention to quality. The choice of exercises should be "practicing the new with the old" and "matching the old with the new". In particular, we should sort out confusing concepts and practice together to deepen our understanding. In this way, students will learn math more easily and happily.