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.

Main content
Current time:0:00Total duration:3:11

Video transcript

let's think about what it means to add numbers so let's start with 1 1 plus 1 plus 1 what is this going to be equal to one way to think about this is we have one thing and I will that thing will be a purple circle so let me put that here so that's this one thing I'm just going to represent it with a purple circle and I'm going to add another one thing and since this is in blue I'll make that other circle I'll make that in blue as well so let me put that right over here so one plus one one plus one how many total circles do I now have well I now have two circles I now have two circles one plus one is equal to is equal to two okay you're saying all right sound like that makes sense let's do this with larger numbers so let's say we want to know what equals and I'll put a question mark over here so question mark what equals so something is equal to is equal to let's say 2 - 2 plus 3 something is equal to 2 plus 3 what is this something going to be and I encourage you to pause the video and think about it on your own well you could view this as I have two objects and then we're going to add another 3 objects how many total objects would I have so you have your two objects which I'll use purple circles 2 again so let me let me so we have 1 & 2 purple circles this is the 2 right over here and then to that we're going to add three more three more circles and I'll represent those in blue because we wrote the three here in blue so that is one two and three so how many total circles do we now have well we could count them we have one two three four five let me count that one two three four five circles so two plus three two things plus another three things are five things so our question mark right over here is equal to five so instead of writing that question mark right over here let me clear that out I could say five is equal to I could write down that five is equal to two plus three