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Lesson 3: Intro to subtracting negative numbers

# Subtracting with integer chips

Let's model subtraction expressions using positive and negative integer chips. To subtract, we'll take away the appropriate number of chips. What if we don't have enough chips to take away? We can add as many zero pairs as we need, because they don't change the value of the expression. Created by Sal Khan.

## Want to join the conversation?

• the reason why they show us this is to prepare us to be able to subtract a negative. this website's lessons are built on understanding the logic behind the simplest things, so they make sense, and are not just something we do in class.
• What are integer chips
?
• Integer chips are counters that are labeled as + (positive) or - (negative). Sometimes they are of two colors, with one color representing a positive counter, and the other color representing a negative counter. These chips can be used to model operations with integers.

Have a blessed, wonderful New Year!
• For the last problem, an easier way to do it, is realize that the minus sign, and the negative sign should immediately cancel out, and turn the minus sign into a plus sign. But Sal's way makes it easier to understand.

Hope this helps!
• who got 100% on quiz 1? i did!
• Me get only 1 wrong rest are correct
• when would we need this ever
• When we might open a shop or something that you get a buisness with and if you don't work that out, you might get bankrupt...
(1 vote)
• This is a very helpful thing for me because it makes me less struggle with math
• awesome to learn good life skill

• ChatGPT is getting too smart for us humans...
• Where do we use negative in real life? Can someone help me answer that question. Please?
(1 vote)
• Maybe you are in debt
• This is tooooooo easy tbh
(1 vote)
• how do you do this
(1 vote)