1. Choose according to children's age: Children of different ages have different cognitive and understanding abilities in mathematics, so it is necessary to choose a math picture book suitable for their age. For example, children aged 3-6 can choose some simple math picture books, such as knowing numbers, shapes and colors. For children aged 7-9, you can choose some deep math picture books, such as fractions, geometry, probability and so on.

2. Choose according to your child's hobbies: If your child is particularly interested in a topic, you can choose a math picture book related to the topic. For example, if children like animals, they can choose some math picture books about the number, size and weight of animals.

3. Choose according to the child's learning progress: If the child has mastered certain mathematics knowledge, he can choose some more complicated mathematics picture books to challenge his learning ability; If children are just beginning to learn mathematics, they can choose some basic math picture books to let them master math knowledge gradually.

4. Choose according to children's learning style: Some children are more suitable for learning mathematics through images, while others are more suitable for learning mathematics through words. Therefore, we can choose a suitable math picture book according to children's learning style.

5. Refer to the advice of other parents and education experts: You can consult other parents or education experts to learn about the math picture books they recommend, so as to make a better choice.