On the number axis, the number on the left must be negative, and the number on the right must be positive? Or do you want to decide which side is the positive direction and which side is the positive number?

On the number axis, the number on the left must be negative, and the number on the right must be positive? Or do you want to decide which side is the positive direction and which side is the positive number?

From the definition of the number axis, it is true. Taking the origin 0 as the dividing line, we stipulate that the right is the positive direction, so the number on the right must be positive, and the left is the negative direction, so the number on the left must be negative! And the unit length of the left and the right must be consistent! This is a common rule in the mathematical world, and it is also a habit of writing!

1,0 is the smallest number; 2,0 is both positive and negative; 3, the negative number is smaller than the positive number; 4, which one of - 4 on the left side of - 7 on the number axis is correct

3