2. The price is different.

3. The speed is different.

4. Wu Ke Cool Math Treasure is a math oral arithmetic artifact. It contains all the calculation requirements of grade 1-6, and every question of 10 is passed. The scope of practice can be addition and subtraction within 10, addition and subtraction of three digits, multiplication formula and oral calculation. You can choose the corresponding exercises according to your own achievements and carry out scientific and systematic training calculation.