Lesson 6 of 9
Picking the right picture
Show on a big screenThree jobs need three kinds of chart. First, votes counted live as hands go up. Second, the book counts of five friends. Third, rain in four months. A chart is a way to show data.
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The rule
Step 1 of 4
- Three different jobs.
- Counting live: tally marks.
- A few small counts already collected: pictograph.
- Bigger numbers: bar graph.
Counting live, one at a time? Tally marks are fastest. Each answer needs only one quick stroke.
A few small counts, already collected? A pictograph is quick to make. A few counts need only a few pictures.
Bigger numbers? A bar graph is easier to read. At one picture for each count, a pictograph needs too many.
Example
Rain in millimetres: 40, 70, 55 and 25. The numbers are big. Use a bar graph.
Pets: 2, 3, 1, 4 and 2. The numbers are small. Use a pictograph.
Try the lab to finish this lesson.