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# Decimals in written form (thousandths)

Learn how to read and write decimals in different forms, focusing on thousandths. Learn how to decompose a decimal into its parts (20,000, 5/10, and 7/1000) and rewrite it as 20,000 and 507/1000. Created by Sal Khan.

## Want to join the conversation?

• Wait, you can put a comma in a decimal problem?!
• Yes, you can, and should according to most Mathematicians. The standard notation is to use a period as a decimal point, and a comma to separate thousands, millions, billions, etc.
For example:
One thousand should be written as 1,000
One thousand and twelve-hundredths should be written as 1,000.12
• I am In College technical math and have always used a calculator to do this simple math how do u write 643.30211 in words. know how to write any thing to the left of the decimal in words but when u combine the tenths place with the hundredths place it confuses me
• So when you deal with decimals you always have to remember that the first number to the right of the decimal is a tenth. The one after it is a hundreth. Say that you have the fraction 1/10. In words, you can say that 1/10 is one tenth and in decimal form, it is 0.1. I'm not sure if I answered your question but I hope this helped.
• this confuses me so much
• same, this is crazy😝
• My son is writing decimals in word form and he did not put the "dash" between the number before the decimal and got it counted wrong. For example, for 85.8 he wrote: eighty five and eight tenths and got it counted wrong because it was suppose to be eighty - five and eight tenths. Do you think this should have been counted wrong? I surely don't! If so please explain your reasoning. Thanks you!
• I don't think so, I agree with your reasoning. The dash is not really needed, but it's a way to show that the number is "connected" and one number.
• Do decimal numbers keep going

And at like you added a comma in 20,000 so I’m confused
• It depends on what kind of decimal you have. Like if you have 0.5, or one half, it can have infinite zeros after the 5. it would like this: 0.5000000000000000. No matter how many zeros you put after the 0.5 it will not change its value. If you were to add a number in there like this: 0.501000, it is no longer exactly one half. Other numbers like pi have an infinite amount of numbers too. It would look like this: 3.1415926535... (dot dot dots are added to show that the number is a "non terminating decimal")
I hope that helps
• Hi, if you have any questions, just ask.
• Have you tried watching a video again?
That might help. :D
• can we just say for example 700.5 seven hundred point five?
• yes, but if you are in a purely mathematical scenario, you might want to use seven hundred and five tenths
• what is 3198,001.632 in decimal work form