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### Course: Staging content lifeboat>Unit 14

Lesson 54: Regrouping decimal numbers

# Regrouping with decimals: 86.93

Sal regroups 86.93 by its place values. Created by Sal Khan.

## Want to join the conversation?

• At , you determine that the number of ones is 36. What would have happened if we had added 15 ones to the 9/10 so that it looks like this : ...=50+21+150/10+9/10+3/100? In other words, can the numerator in the tenths be more than 10? I would tend to say no but I'll let you explain the reasoning behind it.
thank you.
• Why aren't there oneths?
• Let's think about it a moment: What are "oneths"? A "oneth" would be
1/1, so there already is a "oneths" place. It's called the ones'
place. You don't need another. I got this from http://mathforum.org/library/drmath/view/57141.html.
• I'm still not understanding regrouping decimals. Is there any other way to understand this?
• Yes, what they said. It is similar to expanded form.
(1 vote)
• How does the mathematical system work?
• why is there so much stuff to do just for one problem? isn´t there a shortcut?
(1 vote)
• It's definitely a methodical, foundational approach. I don't think I learned it this way when I was in grade school, but it does help when you get to higher level algebra and trigonometry classes to be able to separate various terms into parts like these fairly small numbers. A shortcut could be to use the calculator, but you should at least understand the foundations before going there. I don't really subscribe to the theory that you should hand write everything out, but definitely watch a video or read about a method before using a calculator.
• when was khan acdemy created
(1 vote)
• In 2006, after Sal Khan decided that the videos he made to help his friends and relatives should be publicly available.
(1 vote)
• The answer to the problem is 36, right?
(1 vote)
• why isn't the first decimals place called ones instead of tens