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## Arithmetic (all content)

### Course: Arithmetic (all content)>Unit 2

Lesson 1: Basic addition and subtraction

# Add and subtract: pieces of fruit

Sal adds fruit and subtracts fruit. The examples he uses are 5+3 and 5-3. Created by Sal Khan.

## Want to join the conversation?

• When you get to large numbers such as trillion and quadrillion... are there any real world applications for such large numbers? Is there a quadrillion or quintillion of anything in the universe?
• For example, the mass of the Earth is about 6 million times as large as a quintillion kilograms (that is, the mass is 6,000,000,000,000,000,000,000,000 kilograms).

Another example: the number of molecules in an average drop of water (0.05 millilters) is more than 1,600 quintillion (that is, more than 1,600,000,000,000,000,000,000 molecules).
• Is a decillion a real number? And if it is, how many zeroes are on it?
• Yes sir it is real and it has 33 zeros and a one. A centilion has 600 zeros and a one.
• so if you have 3 and 10 you subtract and 7 would be my answer
• It all depends on how you frame your question.
If you say, "I had 10 from which I took away 3", then the answer would be 7.
10 - 3 = 7
If you meant, "I had 3 from which I took away 10", then your answer would be -7.
3 - 10 = -7
• i don,t get it how imon 5+7
• If you have five objects in one group and seven objects in another group, and you count all of your objects, you have 12 objects. 5+7=12, therefore.
• 2+?=5 2
• The Anwser could be 50 or it could be (1+49-50+50)
• is teachers nies in uter school then in my school because my teacher said to slam the door so i bid but then she said no candy because i slammed the door and now she wants me to whoolk for no reason
• and um when u doing long division do u carry zeros

just a quick question
• it said i had to pause the video and i though it was add? it is right here? And i can't figer it out?
• Sorry, but BOTH of you guys forgot capital letters!
• There are `5` blueberries, which is more than the `3` cherries. In fact, in the video he subtracts `5 - 3` to show what happens if you start with `5` blueberries and then eat `3`. But you can also use `5 - 3 = 2` to find how many more blueberries there are than cherries. He has `2` more blueberries than cherries.