Examples are as follows:

How many people are there between the fifth person and 10 person?

(1) enumeration method: the sequence numbers of natural numbers from the 5th to the 10 are: 5, 6, 7, 8, 9, 10. How many people are there between the fifth person and the 10 person? We need to remove the fifth person and the 10 person, so there are 6, 7, 8, 9***4 people.

(2) Formula:10-5-1= 5-1= 4 people.

Extended data:

Algorithm of integer addition and subtraction:

(1) Same-digit alignment;

(2) from the unit;

(3) When it is added to dozens, it will be pushed to a higher position; If the subtraction is not enough, subtract 1 from the high position. When this number is added to 10, it will decrease.

The essence of subtraction

(1) A number minus several numbers equals this number minus the sum of these numbers.

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

(2) The sum of a number minus several numbers equals to this number minus these numbers continuously.

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