1, addend+addend = sum. And-one addend = another addend.

2. Minus-Minus = difference. Negative difference = negative. Difference+subtraction = subtraction.

3. Factor × factor = product. Product-one factor = another factor.

4. Divider = quotient. Dividend quotient = divisor. Quotient × frequency divider = frequency divider.

"+"is a plus sign, the numbers before and after the plus sign are addends, "=" is an equal sign, and the numbers after the equal sign are sums.

100 (addend)+(plus sign) 300 (addend) = (equal sign) 400 (sum)

"-"is the minus sign, the minus sign is preceded by the minuend, followed by the minus sign, "=" is the equal sign, and the number after the equal sign is the difference.

1000 (minuend)-(minus sign) 300 (minus sign) = (equal sign) 700 (difference)

"×" is a multiplication sign, the numbers before and after the multiplication sign are called factors, "=" is an equal sign, and the numbers after the equal sign are called products.

10 (factor) × (symbol) 200 (factor) = (symbol) 2000 (product)

"#" is the divisor, followed by the dividend, and "=" is the equal sign.

The number after the equal sign is the quotient.

100 (dividend) ÷ 2 (divisor) = 50 (quotient)

Extended data:

The fourth refers to the calculation rules of addition, subtraction, multiplication and division. The expressions of four operations do not necessarily have four operation symbols. Generally, it refers to the operation of combining the majority into a number with two or more operation symbols and brackets.

Addition: the operation of combining two numbers into one number/two decimals into one decimal/two fractions into one decimal.

Subtraction: The operation of finding the other addend by knowing the sum of two addends and one of them.

Multiplication: A simple operation to find the sum of several identical addends. The meaning of decimal multiplication by integer is the same as that of integer multiplication. Multiplying a number by a pure decimal is to find a few tenths of this number, and the meaning of multiplying a fraction by an integer is the same as that of integer multiplication.

Division: the operation of finding another factor by knowing the product of two factors and one of them. It means the same as integer division.

Generally speaking, the binary relation "+"is defined on the set f, which satisfies:

Ⅰ? Law of exchange: for arbitrary? Answer? ，b？ ∈? f？ ，a？ +? b？ =? b？ +? Answer? ∈? f；

Ⅱ? Law of association: for any a, b, c∈F, a? + (b？ +c) = (a？ +b)+c；

Ⅲ? Unit element: There is an element 0 ∈? f？ , satisfy any one ∈? f？ ，a？ + 0 = 0 +? Answer? =? a；

Ⅳ inverse element: for any? Answer? ∈F？ , there is an element-a ∈? f？ , meet one? + (-a) = 0 .

"+"is called addition defined on the set f.

"+"is a plus sign, the numbers before and after the plus sign are addends, "=" is an equal sign, and the numbers after the equal sign are sums.

100 (addend)+(plus sign) 300 (addend) = (equal sign) 400 (sum)

The subtraction of natural numbers is not closed. It is closed unless the minuend is greater than the minuend. For example, 1 1 cannot subtract 26. In this case, use one of two methods:

(1) says that 26 cannot be subtracted from 1 1;

(2) If the answer is an integer representing a negative number, then the result of subtracting 26 from 1 1 is-15.

Multiplication principle: If the dependent variable f and the independent variable x 1, x2, x3,? There is a direct proportional relationship between them. Xn is qualitatively different from every independent variable. Without any independent variables, the dependent variable f loses its meaning, which is multiplication.

In probability theory, an event needs to be divided into n steps, the first step 1 includes M 1 different results, the second step includes M2 different results, and the n step includes Mn different results. Then this event may have different results of N = m 1×m2×M3×Mn.

References:

Baidu encyclopedia-addition, subtraction, multiplication and division