Ten people in the first grade of primary school study mathematics. Primary school mathematics teaches children a series of knowledge such as the understanding of numbers, four operations, the calculation formula of figures and lengths, and unit conversion through textbooks, which lays a good mathematical foundation for junior high school and daily life calculation.

Modern mathematics requires us to observe the world from a mathematical perspective and explain the world in mathematical language. 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. From our educational goal, while imparting knowledge, we should pay more attention to cultivating students' comprehensive ability of observation, analysis and application.

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The relationship between fractions, decimals and percentages. Fractional decimals, that is, numerator divided by denominator, are decimals. When converted into percentages, it is to multiply decimals by 100 and then add a% sign after it, and vice versa.

The above contents refer to Baidu Encyclopedia-Primary Mathematics.