These teaching AIDS are all similar. Don't be confused by the name. You have to learn knowledge repeatedly to be solid. The key is whether it is suitable for your children.

Pass: Primary school mathematics can comprehensively improve students' learning ability through basic level, ability level, development level, comprehensive level, error-prone level and difficult level. The topic has a foundation, a height, and is gradual, neither deep nor shallow. Full-color hand-painting, situational topic setting, original preferred topic, 2 volumes 1 book holder, combination of practice and evaluation, learning in class, and doing well in the exam! Primary school principals' exercise books cover the functions of training, preview and testing. The cartoons inside are lifelike, and the paper is smooth and easy to wipe. More importantly, the answers are separated from the exercises, and the content is color-printed, and the electronic version is explained by famous teachers, which is easy to understand and very good.