Play Video
1
How To Read Number Lines.mov
How To Read Number Lines.mov
::2012/08/30::
Play Video
2
Counting 1 - 10 on the Number Line With Froggy
Counting 1 - 10 on the Number Line With Froggy
::2011/10/03::
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3
Placing Numbers on a Number Line
Placing Numbers on a Number Line
::2010/09/02::
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4
Pre-Algebra 4 - Whole Numbers, Integers, and the Number Line
Pre-Algebra 4 - Whole Numbers, Integers, and the Number Line
::2011/07/29::
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5
number line addition by Peter Weatherall
number line addition by Peter Weatherall
::2008/11/13::
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6
Fractions on a number line
Fractions on a number line
::2013/10/07::
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7
Comparing fractions visually and on number line
Comparing fractions visually and on number line
::2013/10/07::
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8
Number Line Song!
Number Line Song!
::2013/12/13::
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9
The Rappin
The Rappin' Mathematician: "The Number Line Dance"
::2009/02/02::
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10
Learn Grade 1 - Maths - Number line
Learn Grade 1 - Maths - Number line
::2011/10/17::
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11
Number Line - Numberphile
Number Line - Numberphile
::2013/07/30::
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12
Place fractions on a number line (1) - 3.NF.2
Place fractions on a number line (1) - 3.NF.2
::2011/11/22::
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13
How to Read a Number Line
How to Read a Number Line
::2011/12/27::
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14
Learn Grade 1 - Maths - Subtraction Using Number line
Learn Grade 1 - Maths - Subtraction Using Number line
::2011/10/03::
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15
Number line subtraction by Peter Weatherall
Number line subtraction by Peter Weatherall
::2008/11/13::
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16
Lesson 12 From Ratio Tables to Double Number LIne Diagrams
Lesson 12 From Ratio Tables to Double Number LIne Diagrams
::2014/09/24::
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17
Numberline (little extra bit)
Numberline (little extra bit)
::2013/08/19::
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18
Equivalent fractions visually and on number line
Equivalent fractions visually and on number line
::2013/10/07::
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19
Number Line
Number Line
::2011/11/01::
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20
Open Number Line Basics
Open Number Line Basics
::2010/09/19::
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21
Fractions and Mixed Numbers on a Number Line
Fractions and Mixed Numbers on a Number Line
::2012/07/20::
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22
Learn Grade 1 - Maths - Addition Using Number line
Learn Grade 1 - Maths - Addition Using Number line
::2011/10/03::
Play Video
23
Adding Integers Using a Number Line
Adding Integers Using a Number Line
::2010/11/05::
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24
Division on a number line
Division on a number line
::2009/07/04::
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25
Phish - Backwards Down the Number Line 8-31-13 Commerce City, CO live
Phish - Backwards Down the Number Line 8-31-13 Commerce City, CO live
::2013/09/01::
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26
Learn Multiplication Facts using Number Line
Learn Multiplication Facts using Number Line
::2011/10/21::
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27
Elapsed Time Number-Line
Elapsed Time Number-Line
::2013/01/11::
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28
Place Value - Decimals on a Number Line (5-NBT-4 part 1)
Place Value - Decimals on a Number Line (5-NBT-4 part 1)
::2012/09/30::
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29
2.MD.6 - Addition Using the Number Line (Part 1 of 2)
2.MD.6 - Addition Using the Number Line (Part 1 of 2)
::2012/02/07::
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30
Using Double Number Line Diagrams
Using Double Number Line Diagrams
::2012/12/18::
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31
Locating decimals on number line
Locating decimals on number line
::2011/02/26::
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32
Fractions and Decimals: Number Line
Fractions and Decimals: Number Line
::2013/07/23::
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33
Representing Irrational numbers (√2, √3) on the number-line (Part-3)
Representing Irrational numbers (√2, √3) on the number-line (Part-3)
::2012/04/23::
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34
YUNG BB NUMBER LINE FREESTYLE
YUNG BB NUMBER LINE FREESTYLE
::2013/12/26::
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35
Points on a number line
Points on a number line
::2011/01/19::
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36
6.NS.1 Dividing Fractions using a Number Line MaTh LAB 3.8
6.NS.1 Dividing Fractions using a Number Line MaTh LAB 3.8
::2014/09/05::
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37
Rational number on a number line
Rational number on a number line
::2011/06/01::
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38
Using a number line to help children learn to add up
Using a number line to help children learn to add up
::2013/05/01::
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39
Rounding with a Vertical Number Line - Engage NY Math - Common Core
Rounding with a Vertical Number Line - Engage NY Math - Common Core
::2013/09/21::
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40
Plotting inequalities on a number line
Plotting inequalities on a number line
::2013/07/16::
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41
Elapsed Time: How to Solve Elapsed Time on a Number Line
Elapsed Time: How to Solve Elapsed Time on a Number Line
::2014/02/27::
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42
Real numbers and the number line - N3
Real numbers and the number line - N3
::2010/08/06::
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43
Inequalities on a number line
Inequalities on a number line
::2011/01/25::
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44
Rounding Numbers using a Number Line
Rounding Numbers using a Number Line
::2013/08/01::
Play Video
45
Video 2: Numbers line in Microsoft Word
Video 2: Numbers line in Microsoft Word
::2012/07/18::
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46
Algebra 6 - Interval Notation and the Number Line
Algebra 6 - Interval Notation and the Number Line
::2012/06/29::
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47
Plotting basic fractions on the number line
Plotting basic fractions on the number line
::2013/08/02::
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48
Finding The Percent Of A Number Using A Double Number Line
Finding The Percent Of A Number Using A Double Number Line
::2013/04/21::
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49
Counting 10 - 20 on the Number Line with Froggy
Counting 10 - 20 on the Number Line with Froggy
::2011/10/03::
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50
5th Grade Module 1 C   Rounding on Vertical Number Line
5th Grade Module 1 C Rounding on Vertical Number Line
::2014/07/21::
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From Wikipedia, the free encyclopedia
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This article is about the mathematical concept. For the printer's key, see Printer's key.
This article covers basic topics. For advanced topics, see Real line.

In basic mathematics, a number line is a picture of a straight line on which every point is assumed to correspond to a real number and every real number to a point.[1] 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.

The number line

It is divided into two symmetric halves by the origin, that is the number zero.

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[edit]

The number line is usually represented as being horizontal. Positive numbers always lie on the right side of zero, and negative numbers always lie on the left side of zero. An arrowhead on either end of the drawing is meant to suggest that the line continues indefinitely in the positive and negative real numbers, denoted by \mathbb{R}. The real numbers consist of irrational numbers and rational numbers, as well as the integers, whole numbers, and the natural numbers (the counting numbers).

A line drawn through the origin at right angles to the real number line can be used to represent the imaginary numbers. This line, called imaginary line, extends the number line to a complex number plane, with points representing complex numbers.

See also[edit]

References[edit]

  1. ^ Stewart, James B.; Redlin, Lothar; Watson, Saleem (2008). College Algebra (5th ed.). Brooks Cole. pp. 13–19. ISBN 0-495-56521-0. 
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