Factor x factor = product?
Product ÷ One factor = another factor
Department:
Dividend = quotient?
Dividend = divisor
Quotient × Divider = Divider
Multiplicative commutative law: two numbers are multiplied, the positions of two factors are exchanged, and the product is unchanged, which is called multiplicative commutative law. a×b？ =? b×a
Multiplication and association law: three numbers are multiplied, the first two numbers are multiplied and then the third number is multiplied, or the last two numbers are multiplied and then the first number is multiplied, and the product is unchanged. This is the so-called law of multiplication and association. a×b×c？ =? a×(b×c)
Multiplication and distribution law: multiplying the sum (or difference) of two numbers with a number is equivalent to multiplying these two numbers with this number respectively, and then adding (or subtracting) the two products. This is the so-called law of multiplication and division. ? (a？ +? b)？ ×c=？ a×c？ +? b×c(a？ -? b)×c=？ a×c？ -? Others of b×c multiplication
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. Frieden Noel, a Dutch educator, said: "Mathematics comes from reality and must be rooted in reality and applied to reality." ? [ 1]? Indeed, 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.
(Source: Baidu Encyclopedia: Primary School Mathematics)