Addition: 2+3 = 51+5 = 62+6 = 81+6 = 7.

Subtraction is one of the four operations, and the operation of subtracting one number from another is called subtraction; Given the sum of two addends and one of them, the operation of finding the other addend is called subtraction. The symbol of subtraction is "-",which is pronounced as negative sign.

Addition is one of the four basic operations, which refers to the calculation of combining two or more numbers and quantities into one number and quantity. The symbol of addition is the plus sign "+". Connect items with a plus sign when adding.

Extended data:

Four operations:

Multiplication is a simple operation of addition and division is a simple operation of subtraction. Subtraction and addition are reciprocal operations, and division and multiplication are reciprocal operations. Addendum+Addendum = sum, minus-minus = difference.

One addend = sum-another addend, subtraction = minuend-difference, minuend = difference+subtraction.

Factor × factor = product, one factor = product ÷ another factor, dividend ÷ divisor = quotient, divisor = dividend ÷ quotient, dividend = quotient × divisor.

Baidu encyclopedia-subtraction

Baidu Encyclopedia-Supplement