The two addends exchange positions, and the sum remains the same. This is called additive commutative law.

Alphabetic formula: a+b=b+a[ 1]

Example (simple calculation process): 6+ 18

= 18+6

= 24

associative law of addition

Adding the first two numbers, or adding the last two numbers, and the sum is a constant, is called the additive associative law.

Alphabetic formula: a+b+c=a+(b+c)

Example (simple calculation process): 6+ 18+2

= 6+( 18+2)

= 6+20

= 26

2 multiplication operation

Multiplicative commutative law;

The concept of multiplicative commutative law is that two factors exchange positions and the product is unchanged.

Alphabetic formula: a×b=b×a

Example (simplified calculation process): 12×8

=8× 12

=96

Multiplicative associative law:

The concept of multiplicative association law is: the first two numbers are multiplied, or the last two numbers are multiplied, and the product is unchanged.

Alphabetic formula: a×b×c=a×(b×c)

For example: 30×25×4

=30×(25×4)

=30 × 100

=3000

Multiplicative distribution law:

The concept of multiplication and distribution law is: the sum of two numbers, multiplied by a number, can be decomposed and calculated, and the product is unchanged.

Alphabetic formula: (a+b)×c=a×c+b×c

For example: (2+3)× 10

=3× 10+2× 10

=30+20

=50