Video: Using Bar Graphs to Report the Number of Observations

The graph shows the number of books Victoria, Liam, Noah, Matthew, and Olivia have read. Determine the total number of books read.

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Video Transcript

The graph shows the number of books Victoria, Liam, Noah, Matthew, and Olivia have read. Determine the total number of books read.

The bar graph shows us the number of books the children have read. The 𝑥-axis tells us their names. And the 𝑦-axis shows the number of books the children have read. To find the total number of books read, we have to add together the number of books read by Victoria, Liam, Noah, Matthew, and Olivia.

Let’s find that information and write it down. If we draw a line from the top of the bar to the 𝑦-axis, we can see how many books Victoria has read. The 𝑦-axis goes up in twos. Victoria’s bar doesn’t quite meet number two. It’s halfway between zero and two, so Victoria read one book.

If we draw a line across from the top of Liam’s bar to the 𝑦-axis, we can see that he read between 10 and 12 books. As his bar is halfway between 10 and 12, that means he’s read 11 books. Noah has read three books as his bar is halfway between two and four. Matthew has read four books. And Olivia has read the same number of books as Noah, which is three.

Now we need to add together the number of books that the children have read to find the total. First we can add the ones. One plus one is two, plus three makes five, plus four makes nine, plus three makes 12.

We can write the two in the ones place and we have to carry the 10 over to the 10s column to remind us to add it on later. So if we move across to the 10s column, we can see we have one plus one, which makes two. So the total number of books read is 22. We’ve found the number of books that each child has read and added them all together.

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