Wenwen's home is 508 meters away from the school. He went back and forth to school twice, and once he had to walk 2320 meters.

Mathematics knowledge points in the first volume of the third grade of primary school:

1, an object, a unit of measurement or a whole composed of many objects can be expressed by a natural number 1, which we usually call the unit "1". Divide the unit "1" into several parts on average, and the number representing such a part or parts is called a fraction. The number representing one of them is called a fractional unit. What is the denominator of a fraction? Its decimal unit is a fraction.

2. The larger the denominator, the smaller the decimal unit, and the decimal unit is 1/2.

3. Give an example to illustrate the significance of a score: 3/7 means dividing the unit "1" into 7 parts on average, that is, 3 parts. That is to say, divide 3 into 7 parts on average, which is 1 part. 3/7 ton is to divide 1 ton into 7 parts on average, and that's it. That is to say, divide 3 tons into 7 parts on average, that is, 1 part.

4, 4 meters of 1/5 is 4/5 of the length of 1 meter.

5. Fractions with numerator smaller than denominator are called true fractions; Fractions with numerator greater than denominator or numerator equal to denominator are called false fractions.

6. The true score is less than 1. False score is greater than or equal to 1. True scores are always less than false scores.

7. If the number of boys is 3/4 of the number of girls, the number of girls is 4/3 of the number of boys.

8. Relationship between fraction and division: dividend is equivalent to numerator of fraction, and divisor is equivalent to denominator of fraction. Divider ÷ Divider = Divider If A stands for dividend and B stands for divisor, it can be written as a÷b=b(a)(b≠0).

9. A false fraction that can be converted into an integer whose numerator is a multiple of the denominator. On the contrary, the numerator is a false fraction of the denominator multiple and can be turned into an integer. (numerator divided by denominator)

10, where the numerator is not a false fraction of the denominator multiple, can be written as a number consisting of an integer and a true fraction, usually called a fraction. Getting points is another form of false points. For example, 4/3 can be regarded as the composite number of 3/3 (i.e. 1) and 1/3, which is read as one and a third. Band scores are all greater than real scores, and they are all greater than 1.