In basic mathematics, a number line is a picture of a straight line that serves as abstraction for real numbers, denoted by . Every point of a number line is assumed to correspond to a real number, and every real number to a point.
Often the integers are shown as specially-marked points evenly spaced on the line. Although this image only shows the integers from −9 to 9, the line includes all real numbers, continuing forever in each direction, and also numbers not marked that are between the integers. It is often used as an aid in teaching simple addition and subtraction, especially involving negative numbers.
In advanced mathematics, the expressions real number line, or real line are typically used to indicate the above-mentioned concept that every point on a straight line corresponds to a single real number, and vice versa.
Drawing the number line
A number line is usually represented as being horizontal, but in a Cartesian coordinate plane the vertical axis (or y-axis) is also a number line. According to one convention, positive numbers always lie on the right side of zero, negative numbers always lie on the left side of zero, and arrowheads on both ends of the line are meant to suggest that the line continues indefinitely in the positive and negative directions. Another convention uses only one arrowhead, which indicates the direction in which numbers grow; the line continues indefinitely in the positive and negative directions according to rules of geometry, which define a line without endpoints as infinite line, a line with one endpoint as ray, and a line with two endpoints as line segment.
MOSCOW — University of Idaho students and other Moscow residents had to wait in line for hours during Election Day to cast their vote as poll workers were “overwhelmed” by the large number of voters, according to the Latah County auditor.
The Greece-based cruise line is interested to explore opportunities for the operationalization of inter-island cruising in the Philippines... In its website, the Variety Cruises said it is a private yacht cruise line based in Athens, Greece.
Yet, Linton and his team acknowledge Herd games are a different animal, especially as they hope to attract three times the number of patrons ... the long concession lines that greeted them in the past.
...CEO Prateek Bayal gathered information from the college principal about specific infrastructure needs, such as classrooms, laboratories, and sports facilities, in line with the number of students.
They’re not like-for-like players as Eberle is a top-line forward and is more proven defensively ... With Eberle out for the final 39 minutes of the game, the Kraken rotated a number of forwards to join Beniers and McCann on the top line.
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Through August, the most recent month for which data is available, the number of passengers entering YellowLine stations was down 8.5% from the year before, even as overall “L” ridership was up.
Jones and Miocic will meet in the octagon at Madison Square Garden this Saturday with the heavyweight title that the former won against Ciryl Gane on the line ... him out of action for a number of months.
The Office for Students (OfS) said that based on current trends, up to 72 per cent of providers could fall below the line by 2025-26, with a significant factor being a reduction in student numbers.
Barkley’s dual scores in 20 seconds then all but wrapped up Philadelphia’s win, a consolation touchdown in the dying seconds not enough for Washington to get across the line.
The DMV director, Steve Gordon, explained that reducing the number of people needing the written test will lead to shorter lines and faster services at DMV offices across the state.
It added that the licence plates would be reserved for electric vehicles only. This move would bring the total number of environmentally-friendly vehicles in the company's taxi fleet to 87 per cent – in line with the UAE's Year of Sustainability ... UAE ... .
The Office for Students (OfS) said up to 72% of providers could fall below the line by 2025-26 based on current trends, with a reduction in student numbers a significant factor.
. Every point of a number line is assumed to correspond to a 
Chicago Tribune
15 Nov 2024
Chicago Tribune
15 Nov 2024