Ted went with number 13 to his house.There, he was surprised to see that all the houses were placed in a straight line at equal distances. Neighbors of 13 were 12 and 14; similarly 14 had 13 and 15 as neighbors. 13 said, “This line, mathematically, is called a ______.”
number line
A number line is an arrangement of real numbers, which graphically expresses them as a series of points distributed about a point arbitrarily designated as zero. The magnitude of each number is represented by the distance of the corresponding point from zero.