In the second grade, one foot is about 20 cm, one step is about 60 cm, one foot is about 170 cm, and one foot is about 22 cm. One foot, that is, the distance between thumb and middle finger as far as possible, is generally 20 cm for men and slightly less for women. One step is a step for us to walk, about 69 cm for men and 50 cm for women. A moment is the distance between our arms and our fingertips. This length is about our height, about 170 cm for men and 160 cm for women. One foot is the length of our feet, about 22 cm for men and 20 cm for women.

One step at a time.

The length of each step is uncertain. This is the content of the second grade math class in primary school. Its purpose is to make primary school students realize the importance of the unity of length units. One step is what we call a long step. We know that the steps of adults and children are different, so the length of a step is different for different people.

In the same way, so is one foot. One foot is the length between thumb and forefinger, and the other is the length between arms. So people are not sure about the length of one foot and one foot, but our centimeters and decimeters are fixed, so the purpose is to make students understand.