Bar Graphs

Sometimes instead of more complicated pictures,
we use squares as symbols to show our data.

​

​Let's review the features of a pictograph

Pictograph

Bar graph

To make graphs simple, we can join the squares into columns or rows to make bars.

Compare the graphs and introduce vocabulary. See pp. H-3–4 for details.

These graphs show the same data.

Look at this bar graph, then do the exercises on the next slide.

From BLM Snack Bar Graphs (p. H-46). See p. H-5 for details.

Ask questions to check that students can read the data on the graph. See p. H-5 for details.

Bars are like pictograph symbols: one block can mean more than one thing.

What is the scale of this bar graph?

Look at this bar graph, then do the exercises on the next slide.

From BLM Bar Graphs for Display (1) (p. H-47). See p. H-5 for details.

What does this graph show?

This table shows a tally of student bedtimes.

See pp. H-6–7 for details.

Using the paragraph of text that I've provided,
create a bar graph that shows the frequency of
each letter in the text.

Which were the three most frequent letters?

See p. H-10 for details.

AP Book 5.1 pp. 152–154

New Canadian Edition