Knowledge points of addition and subtraction from positive and negative numbers to integral The finer the better

Knowledge points of addition and subtraction from positive and negative numbers to integral The finer the better

++Get-
--Get+
+-Get-
-a²=-a
（a)²=+a

How to summarize the positive and negative numbers of mathematics in Volume 1 of Grade 7!

1. Divide numbers other than 0 into positive and negative numbers. 0 is the boundary between positive and negative numbers
2. A number larger than 0 is called a positive number, a number smaller than 0 is called a negative number, and 0 is neither positive nor negative

The details of positive and negative numbers in the first lesson of mathematics PEP
What's more, the key content and knowledge point

In our life and production, we often encounter quantities with opposite meanings, such as three degrees above zero and six degrees below zero, six meters forward and six meters backward, the elevation of Mount Everest and Turpan on the map used by primary schools, etc