1, material: white cardboard.

2. The size of each card: 10 cm *25 cm rectangle. (a little more, the child looks effortless, and the specific size can be adjusted by parents. )

Write a formula (and the answer) on each card with a black marker: for example, 1+ 1=2.

4. Write all the addition formulas on the white board-45 in all.

Oral calculation: mental calculation and oral calculation are carried out at the same time. Oral arithmetic is to calculate with the brain and remember the results at that time with oral narration. This method is used for quick calculation, and regular practice is helpful to improve intelligence. It has also become the mainstream calculation method today. Also called "mental arithmetic". One of mathematics teaching methods.

A calculation method based on thinking and language activities without any tools. It can train students to calculate quickly and develop their attention, memory and thinking ability. Proficiency in verbal calculation is helpful for written calculation and is convenient for daily use.

The arrangement and difficulty of oral arithmetic-the textbook of quick mental arithmetic is closely related to the syllabus of primary school mathematics, which accords with the quick calculation of junior high school algebra and is simpler than the textbook of primary school. Simplify written calculation and strengthen oral calculation. It is simple, easy to learn and interesting. After a short period of training, primary school students can write answers directly by adding, subtracting, multiplying and dividing, not vertically.