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### Course: Class 6 (Old)>Unit 2

Lesson 6: Identity properties of 0 and 1

# Identity property of 1

The identity property of 1 says that any number multiplied by 1 keeps its identity. In other words, any number multiplied by 1 stays the same. The reason the number stays the same is because multiplying by 1 means we have 1 copy of the number. For example, 32x1=32.   Created by Sal Khan and Monterey Institute for Technology and Education.

## Want to join the conversation?

• How would you solve 2888 x __ = 1?
• 1/2888
• how do you get the same number in multiplication but not in addition so basically 1 is like plus 0 in multiplication?
• Multiplying by one is like saying "I have one set of this" so, in a way, yes, you're right, but it isn't a very good idea to think like that, because it will cause you to get confused later on.
• why are questions less and videos more. i didnt like it
• Yeah. I don't like it too. Maybe there is more videos to prepare you more to your path to mastery.
• Why does he sometimes use the dot for the multiplication symbol?
• The reason why he uses the dot, is because of algebra. Once you get into algebra you stop using an x for multiplication, because it gets confusing when you have variables, which you do most of the time in algebra. The most common letter to use as a variable is an x, so 8xx is very confusing.
• What does it do
• The identity property of 1 is trying to tell you that any number multiplied with 1 retains its identity. In other words, its value does not change.
Hope this helps.
• Feels like Sal is teaching us multiplication?
• The identity property of 1 is based on what happens when you multiply with 1. It basically is trying to show you that any number multiplied by 1 will = the original number (its identity is not changed).
• what happens if it is 56'2
• 56 times 2 = (50+6) times 2 = (50 times 2) + (6 times 2) = (100) + (12) = 112;
something times 2 is double the something, like 4*2 = 8;
"double it" should not be confused with "doublet." ;)
• If you multiply a value by -1, would it still be considered the Identity Property of Multiplication?