Practice of addition and subtraction within 5 10 and 20 in this kindergartens middle and large classes. Math oral calculation question card 100 for elementary school students thinking

Brand: Tai Kaixin. Product Name: Tai Kaixin. Textbook type: Arithmetic book. Production company: Taixinxin. Color classification: Complete set of 9 mathematics specialized courses, complete set of 6 addition and subtraction courses, complete set of 5 courses, and complete set of 4 courses. 10+20 Addition and subtraction+decomposition and composition 4 courses Ten making method+Ten breaking method+Flat ten method+Borrowing ten method. Brand: Tai Kaixin. Product Name: Tai Kaixin. Textbook type: Arithmetic book. Production company: Taixinxin. Color classification: Complete set of 9 mathematics specialized courses, complete set of 6 addition and subtraction courses, complete set of 5 courses, and complete set of 4 courses. 10+20 Addition and subtraction+decomposition and composition 4 courses Ten making method+Ten breaking method+Flat ten method+Borrowing ten method