Connect mathematical lessons to real-world scenarios, especially those that are relevant to students' lives. Math can be a very abstract, theoretical field whose practical applications may not be apparent to students. You can stress the day-to-day relevance of it by using real-life examples in your lessons.
Use illustrated word problems. Word problems present mathematical puzzles in a narrative form, in which "characters" discuss a mathematical conundrum involved in some hypothetical situation. Illustrate these word problems with pictures and comics to make the lesson less abstract and more visually appealing.
Go on math-related field trips. Field trips help get students excited about a field of study and serve to emphasize the real-world relevance of educational subjects. Math-related field trips could include excursions to scientific research facilities and labs; businesses or government agencies working in aeronautics, robotics, or some other exciting, cutting-edge field or, for example, a particle accelerator or some other high-tech physics facility.
Inject humor into the classroom. Math doesn't necessarily have to be dry and humorless. A bit of comic relief can go a long way in maintaining students' attention and interest.
Incorporate math-related games into the lesson. For example, split the class into two teams and make solving a series of problems a competitive activity. For younger learners, numbers games can be adopted to turn a math lesson into a fun activity.