The method of making up ten is the addition operation of primary school mathematics. Adding another number to a number to make it "ten" is called making ten. For example, add "2" to "8" to make it full of "10". When calculating the sum of several numbers, the method of adding two or three numbers whose sum is ten or dozens, or whose sum is ten, is called the complement ten method. With the method of ten, the result can be calculated quickly.
Rounding method is the basis of rounding method. Is the simplest and most elementary rounding method. When several numbers obtained by rounding method are added, first calculate the numbers that can add whole ten, whole hundred, whole thousand and whole ten thousand. According to one addend, one addend increases and the other addend decreases by the same number, and their sum remains unchanged. Turn a number close to whole ten, whole hundred, whole thousand and whole ten thousand into a number of whole ten, whole hundred, whole thousand and whole ten thousand. Among the fast calculation methods of addition and subtraction, rounding is the most commonly used and the best method.
Matters needing attention in primary school students' learning mathematics
1, cultivate interest in mathematics: Mathematics is a relatively abstract subject, which requires children to keep interest and curiosity in learning, so as to better master addition and subtraction.
2. Determine the basic concepts: the basic concepts of addition and subtraction include addend, addend, sum, subtraction, minuend and difference. Children must master these basic concepts before learning addition and subtraction.
3. Know numbers: Children need to know numbers when learning addition and subtraction, be able to read and write numbers skillfully, and understand the relationship between numbers.
4. Control the speed: When children do the practice of addition and subtraction, they should gradually master the appropriate speed to avoid mistakes due to excessive pursuit of speed.
5, master the operation rules: children need to master the correct operation methods and rules, such as adding advanced bits, reducing first and then reducing.