To improve the ability of oral calculation, the first point is to practice frequently, which can activate people's cerebral cortex, improve people's thinking ability and exercise people's thinking agility. The second point is to master some small skills of oral calculation. You should exercise regularly and remember some special knowledge. For example, you can remember that 4 times 25 is equal to 100, and you can think so when you do oral calculations. 32 times 25 is 8 times of 4, so the result of 32 times 25 is 8 times of 100, which is 800.