If you want children to really understand the meaning of addition and subtraction, then you should let them operate in kind, practice constantly and understand from practice. Because it is said that mathematics is the gymnastics of thinking, understanding the meaning of addition and subtraction can really exercise children's thinking.

Addition is actually adding two sets together to become one set.

Subtraction: Divide a set into two parts.

Subtraction formula

1, minuend-subtrahend = difference

2. Difference+Minus = Minus

3, the minuend-difference = reduction

Subtraction correlation characteristic

1, inverse exchange rate: subtraction is inverse exchange. If A and B are any two numbers, then

(A-B) =-(B-A)

2. Anti-association rule: subtraction is anti-association. When trying to redefine subtraction, then

a-b-c=a-(b+c)