The analysis process is as follows:

Today I read from 1 1 to 17, and tomorrow I should read 18. It means that we read from 1 1 to 17 today. The natural numbers from 1 1 to 17 are 1 1,12,65438 respectively. A * * * has seven pages.

The formula is:17-11+1= 6+1= 7 pages.

Extended data:

Integer addition and subtraction algorithm;

(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.

Addition has several important properties. It is interchangeable, which means that the order is not important, it is interrelated, which means that when more than two numbers are added, the order in which the addition is performed is not important. Repeatedly adding 1 is the same as counting; Adding 0 will not change the result. Addition also follows related operations such as subtraction and multiplication.

Decimal method: a calculation method, that is, when the unit is not reduced enough, subtract the subtraction with 10 and add the remainder to the unit, that is, decimal method.

Break the ten-law formula

A dozen MINUS nine, a few plus one; Ten MINUS seven, a few plus three; A dozen MINUS five, a few plus five; One dozen MINUS three, several plus seven; A dozen MINUS eight, a few plus two; A dozen MINUS six, a few plus four; A dozen MINUS four, a few plus six; A dozen MINUS two, a few plus eight.