According to the meaning, 1 egg weighs about 50g, 1kg = 1000g, 1000 ÷ 50 = 20 (egg). This question examines the conversion of names. If you convert the name of a high-level unit into the name of a low-level unit, you can multiply the rates between units, and if you convert the name of a low-level unit into the name of a high-level unit, you can divide it by the rates between units.

Number+company name = name number, and only one company name is called singular. There are two or more unit names called composite numbers.

If the number of high-level units is changed from meters to centimeters, and the number of low-level units is changed from centimeters to meters, there is only one unit for a single number, such as 5 hours and 3 kilograms. Total number, such as: 5 hours and 6 minutes, 3 kilograms and 500 grams (in two units).

The importance of learn mathematics:

1. Mathematics is closely related to our life. To say that the real effect of learning mathematics is not reflected in exam-oriented education, but in my own thinking about the future.

2. The importance of mathematics is self-evident. Mathematics is the foundation of all sciences and an important channel to cultivate logical thinking. It can be said that every major progress of our mankind is strongly supported by mathematics.

3. The application of mathematical knowledge in life is everywhere. From the calculation of daily living costs, to astronomy, geography, quality control, agricultural economy, aerospace, there are shadows of using mathematics.