Eight meters of cloth is used to make four sets of clothes, that is, two meters of cloth is needed to make one set of clothes, and eight sets of clothes are 2×8 meters of cloth, that is, 16 meters of cloth is needed to make eight sets of clothes.

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This mathematical knowledge comes from primary school mathematics. Primary school mathematics is to teach children a series of knowledge about number, four operations, the calculation formula of figure and length, unit conversion and so on through textbooks, which lays a good mathematical foundation for junior high school and daily life calculation. Judging from the mathematics learning psychology of primary school students, the learning process of students is not a passive absorption process, but a reconstruction process based on existing knowledge and experience. Therefore, learning while doing and learning while playing will make children learn more actively.