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Video: Reading Data from a Horizontal Bar Graph Involving Subtraction

Tim Burnham

A survey was conducted to find the favorite hot dog toppings for a number of people. The bar graph represents the results of the survey. How many more people like Chili than Ketchup?

01:11

Video Transcript

A survey was conducted to find the favourite hot dog topping for a number of people. The bar graph represents the results of the survey. How many more people like chilli than ketchup?

Let’s look at our bar graph then. We’ve got a variety of different toppings, and we can see how many people like each of those toppings by looking at the length of the bars. So for ketchup, if we look up here, we can see that if we follow this down, that’s six people; in fact, it tells us six people there. And for chili, if we follow this down, we can see that there are ten people, and that agrees with the fact that it says there are ten people.

And the question says, how many more people like chilli than ketchup? So what we’re saying is-is, how much bigger is ten than six? So if I subtract six from ten, which gives me four, that tells me the difference between those two numbers.

So our answer is, four more people like chilli than ketchup. And in terms of method, it was just the difference between the number of people that like chilli and the number of people like- that like ketchup, and that’s a subtraction.