This is informal knowledge a pupil has about numbers before getting introduced to the formal concept in formal school.This knowledge is predominantly from the home background where the pupil interacts with the adults and the peer with the use of terms such as;
one,two,three,.......greater than,less than,equal to,more than,...etc.
Pre-number concept varies from one pupil to the other depending on the background the pupil comes from and therefore it is imperative for the teacher to take time to understand the pupils individually before the formal introduction of numbers in class is done.
paul-Kenya
A double number line is a standard concept in math and arithmetic. This concept is usually taught in algebra courses.
Inequalities
Number!
You cannot. A number is an abstract mathematical concept and, therefore, have no length.
The number does nothing. It is merely a mathematical concept.
A number line is a one-dimensional concept and therefore has no area.
The concept of an opposite is simple. The opposite of a number is a negative. For example, the opposite of 35 is -35.
Romans did not understand the concept of a zero.
mass number
The fundamental property of the real number system is the concept of a successor to a whole number (Peano).
Infinity is not a number, it is an idea, or a concept. There are an infinite amount of numbers, but infinity is not one of them.
Technically the number zero is a concept. It is neither positive nor negative.