Product number refers to the accumulated number or quantity or the arithmetic product of two numbers.
Sum refers to a new thing obtained by adding two or more things with the same nature, and can also be narrowly understood as the result of adding two numbers.
Harmony is a new thing obtained by adding things with the same attributes, such as 2 meters +3 meters =5 meters; 30 kg +50 kg =80 kg. But things with different attributes and different units cannot be added by numbers or simply added, such as 5 m/s+10 s; 5 minutes+1 hour.
Generation of sum: addend+addend = sum.
Words expressing the sum: * * *, all, total, etc.
Extended data:
Difference, a mathematical term, refers to the result of subtracting two numbers.
A mathematical operation, especially the result of subtracting two numbers.
For example: 3-2= 1, read: the difference between 3 and 2 is 1.
In a division formula, the relationship between dividend, remainder, divisor and quotient is: (dividend-remainder) ÷ divisor = quotient, which is recorded as dividend ÷ divisor = quotient ÷ remainder, and then the quotient × divisor+remainder = dividend is derived.
When the number A is divided by the number B (non-zero), its quotient is called complete quotient. For example, 9÷3=3, and 3 is the complete quotient.
If the number A is divided by the number B (non-zero), the quotient obtained is incomplete. For example: 10 ÷ 3 = 3... 1, where 3 is an incomplete quotient.