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Lesson 3: Rational numbers on the number line

# Decimals & fractions on the number line

Plotting numbers on a number line is a fundamental math skill that helps visualize numerical values. Key points include identifying whole numbers, fractions, and decimals, and placing them accurately on the line. This skill enhances understanding of number relationships and builds a strong foundation for more advanced math concepts. Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• what is a number line?
• A number line is an orderly line of numbers. It helps with understanding the distance between the numbers.
• Can someone please explain the - numbers on the line? I always get that part wrong on the exersise! :P
• «A negative number is any real number that is less than zero. Such numbers are often used to represent the amount of a loss or absence. For example, a debt that is owed may be thought of as a negative asset, or a decrease in some quantity may be thought of as a negative increase. Negative numbers are also used to describe values on a scale that goes below zero, such as the Celsius and Fahrenheit scales for temperature.

Negative numbers are usually written with a minus sign in front. For example, −3 represents a negative quantity with a magnitude of three, and is pronounced “minus three”. Conversely, a number that is greater than zero is called positive; zero is usually thought of as neither positive nor negative. The positivity of a number may be emphasized by placing a plus sign before it, e.g. +3. In general, the negativity or positivity of a number is referred to as its sign.»

From http://en.wikipedia.org/wiki/Negative_number
• could infinity be the number line or be ablo to plot
• Let's assume ,
We have plotted infinity in a number line.
Wait a second , do we know what is infinity ?
No we don't . So we can't plot it .
Let's assume,
We have accidently plotted infinity . But I can
say there is more on the number line . I can
plot infinity + 1 , infinity + 2 . So what is infinity .
I don't know .
• So is negative numbers like decimals?
• In a sense, negative numbers could be related to decimals because place values of decimal digits involve taking 10 to negative powers.

However, negative numbers do not have to be decimals (for example, -3) and decimals do not have to be negative numbers (for example, 0.2). While negative numbers are below zero, decimals have a fractional part (that is, the part after the decimal point).
• has pie ever been put on the numberline starting from 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 2 3 all the way to pi has anyone put a numberline like that in human kind
• no, one of the most rational expressions to calculate pi is 22/7. This expression gets some of the digits of pi correct.
• How does he make all these videos?
• magic
• mic quality just went to 2007
• i mean, the video was made 12 years ago
• How Long Can A Number Line Be?