After playing, Ted remembered that he doesn’t have a home there. Luckily, number 13 was passing by and asked him if he wanted to stay at its place. Having no other option (and surprised that number 13 brought good luck), Ted went with 13. When he reached the house, he was surprised to see that all the houses were placed in a straight line at equal separation. Neighbors of 13 were 12 and 14; similarly 14 had 13 and 15 as neighbors. 13 said, “This line, mathematically, is called ______.”
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.