![]() So, I want to start at six above zero, but then I want to add negative two, which should take me two steps back down. So on a vertical number line like this, it seems like we're I want to start at six and I want to add negative two. So here, they've taken our number lines but they've made them go up and down, they've made them vertical. ![]() Which number line model represents the expression six plus negative two. So that's definitely the model that represents that expression. We're going to add a negative seven which makes us move seven to the left again to get to negative nine. So you can think of this arrow as representing negative two, and then we're going to that, so we're starting from So one, two, three,įour, five, six, seven. So this is negative two, and then we take another seven steps to the left of that. Let's see, we have this first arrow that takes us two steps And then this last one, hopefully this is the answer, otherwise there would be a mistake in the exercise. Or you could view this as negative five plus negative four, but that's not what we have up here. So you could view this as negative five minus four. So starting at negative five, and then it goes another one, two, three, four to the left of that. I guess you could say this thing, this arrow, it's going one, two, three, four, five to the left of zero. This one right over here, let's see, this first. But that's not what we have over here, we have negative two minus seven. This is the model that would be for positive two plus negative seven, or two, or positive two minus seven. This number line model I guess we could call it, it's saying this is positive I want to start at negative two and then to that I want ![]() So this question asks us, "Which number line model represents "the expression negative two "plus negative seven?" And a number line model seems like this really fancy thing, but they're just saying, which of these diagrams, which of these drawingsĪre a way to think about what negative two plus negative seven is. The number line exercise on Khan Academy, so that we can think aboutĭifferent ways to model, or think about, or visualize adding and subtracting positive and negative numbers. What I now what do in this video is do a bunch of examples using the adding negative numbers on Already spent some time introducing ourselves to the idea of adding or subtracting positive and negative numbers.
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