How to count the columns of corn?

Connect each string in series with toothpicks, and then count the toothpicks to know how many columns there are.

Ways to learn mathematics well:

1, to learn mathematics well, we must first develop the habit of previewing. This is a good way for me to study mathematics for many years, because I know what I can't do by learning what the teacher should say first in advance, and I have a focus when I study. Of course, it would be better if you taught yourself completely.

2. The second is to do the questions after the book. Preview is not an end. If you have time, you can do examples and exercises after class and check the preview. If you can explain everything, you can learn it. Even if you can't, you can listen to the teacher again.

Step 3, do the homework assigned by the teacher and do it carefully. When you do it, you can write the problem-solving process directly next to the topic, such as multiple-choice questions and fill-in-the-blank questions, because there are many blanks to write in the solution. The advantage of this is that the teacher can keep up with the ideas when talking about the topic, and it is not easy to get distracted.

Matters needing attention in doing farm work:

The farm work that farmers need to do all year round is reflected in 24 festivals. The twenty-four solar terms not only reflect the changes of seasonal climate, but also guide agricultural activities.

Beginning of spring: It means the beginning of spring. After beginning of spring, everything revived and was full of vitality. As a result, farmers will sow all year round.

Rain: At this time, the spring breeze has blown all over the earth, the ice and snow have melted, the air is moist, and the rainfall will increase. Rain will be the solar term, and wheat will enter the jointing and booting stage one after another, which is the period when fertilizer is most needed and water is most feared. There is a saying that "one foot of wheat is afraid of one inch of water", and it is necessary to do a good job in the field management of "protecting the area, watching the seedlings and fertilizing, and clearing the ditch and draining water".