Simple method is a special kind of calculation, which makes use of the algorithm and the basic properties of numbers, thus making the calculation simple and making it easy to calculate numbers from very complicated formulas.

Using simple calculation methods in mathematics can greatly save the time of doing problems.

Simple arithmetic

1, additive associative law?

The law of additive combination is (a+b)+c=a+(b+c).

For example, 8+1+9 = 8+(1+9) = 8+10 =18?

2. additive commutative law?

a+c=c+a .

Such as 8+5=5+8= 13.

3. Multiplicative associative law?

(axb)xc=ax(bxc).

For example 3x2.5x4 = 3x (2.5x4) = 3x10 = 30. ?

4. Multiplication and distribution law?

(a+b)xc=axc+bxc .