WEBVTT

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Let's think about what it means to add numbers.

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So let's start with one. 
One plus -- one plus one.

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What is this going to be equal to?

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One way to think about this is 
we have one thing.

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And I will -- that thing will be a purple circle.

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So let me put that here.

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So that's this 1 thing.

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I'm just going to represent it with a purple circle.

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And I'm going to add another 1 thing.

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And since this is in blue, 
I'll make that other circle.

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I'll make that in blue as well.

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So, let me put that right over here.

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So, 1 plus 1. 1 plus 1.

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How many total circles do I now have?

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Well, I now have 2 circles.

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I now have 2 circles.

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1 plus 1 is equal to 2.

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OK, you're saying, "All right, Sal, that makes sense."

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Let's do this with larger numbers.

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So let's say we want to know what equals--

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and I'll put a question mark over here. 
So, question mark.

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What equals --

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So something is equal to, let's say, 2, 2, 2 plus 3.

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Something is equal to 2 plus 3.

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What is this something going to be?

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And I encourage you to pause the video 
and think about it on your own.

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Well, you can view this as, 
I have 2 objects,

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and then I am going to add
another 3 objects.

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How many total objects would I have?

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So you have your 2 objects, 
which I'll use purple circles again.

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So let me --

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Let me, so we have 1 and 2 purple circles.

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This is the 2 right over here.

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And then to that, 
we're going to add 3 more.

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3 more circles.

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And I'll represent those in blue, 
because we wrote the 3 there in blue.

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So that is 1, 2, and 3.

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So how many total circles do we now have?

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Well, we can count them. 
We have 1,2,3,4,5.

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In fact, let me count that. 
1,2,3,4,5 circles.

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So 2 plus 3

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2 things plus another 3 things 
are 5 things.

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So our question mark over here 
is equal to 5.

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So, instead of writing the question mark

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right over here, let me clear that out.

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I could say 5 is equal to --

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I could write down that 5 
is equal to 2 plus 3.