Knowledge and skills:
1. Understand the meaning of negative numbers and use them flexibly.
2. Count the points on the axis.
3. The size of two numbers will be compared.
It doesn't involve negative operations, it's very simple.
1, the problem of negative numbers in mathematics in the sixth grade of primary school
A: The quantities with opposite meanings are two numbers. Their positive and negative signs are opposite, which means that their positions relative to the reference point (0 point) are different, and whether their absolute values are equal or not is not important. Corresponding antipodes, antipodes are quantities with opposite signs, and their absolute values must also be equal.
Specific to the number you said: 7 meters up and 5 meters down are opposite quantities, but they are not opposite numbers. The two opposite quantities are definitely wrong.
7 meters up and 5 meters down are opposite quantities and opposite numbers.
Example:
An east-west road stipulates that the east is positive and the west is negative.
Two cars, starting from point A, heading for both ends respectively, car 1 heading east 10 km, marked as+10; Car No.2 is heading west 10 km, which is marked as-10.