If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

## Pre-algebra

### Course: Pre-algebra>Unit 2

Lesson 1: Math patterns

# Math patterns: table

Sal explains a pattern with the number of seats at a table. Created by Sal Khan.

## Want to join the conversation?

• From 18 to 22, the difference is 4, not 5. ERROR!
• Up vote If you like dragons Or wings of fire🐉🐲🐉🐲🐉🐲
• I dont get this at ALL.😭😭😭 Can some one help me
• When each table goes together, two sides touch. You can't fit in between two tables. Think of it like puzzle pieces. There are 4 sides but when you put them together there is no room in between the two pieces. Kind of like perimeter and area if you know that. If there is something else that you don't understand just ask!
• How did they come up with them.
• What if you had zero or a half of a table ? What about negative tables?
• how would you even reach a negative number of tables? And if it is zero tables then zero people can fit in.
• Sal, I think you made a mistake at the very end, it's supposed to be 23. Cause you're adding 5 to 18 and so you should be able to fit 23 because 5 + 18 is 23.
• @ in the video, there is a correction box that displays to tell you that Sal meant to write +4, not +5. Since 18+4 = 22, the final result is correct.

Note: You can only see correction boxes if you don't watch in full screen mode. So, anytime you think there is an error, drop out of full screen mode and look for a correction box.
• vote upvote if you love god
• um who made this up