3
Making a picture graph
Discover Mathematics: Chapter 4
GoalCollect answers with tally marks, draw them as a picture graph, and answer questions about it.
New words
data · answers we collecttally · a line for each answerpicture graph · pictures in rows that show how many
Explanation
To make a picture graph, first ask a question, such as: which fruit do you like best? Then collect the answers with tally marks, one line for each child. Next, make a row for each fruit and draw one picture for each tally line. Now you can count each row, find the row with the most pictures, and add the rows to see how many children answered.
Worked examples
Here are the same answers as a picture graph, one picture for each child. 5 children chose bananas, 3 chose apples and 4 chose grapes. 12 children answered.
Karim’s class shows how they come to school. 6 come by bus, 4 by car and 3 by tuk-tuk. The most children come by bus.
Steps for a picture graph: ask, tally, draw a row for each answer, count, then answer questions.
Class activity
Our graph. Ask 10 people which game they like best: football, hide-and-seek or skipping rope. Use tally marks on paper to collect the answers. Then draw a picture graph with one small drawing for each answer. Which game won?
Practice
1
How many children chose tea? How many chose juice?
Tea 5, juice 7.
2
Which fruit got the fewest votes? Count each row.
Pears. They have 3 pictures.
3
Count the tally marks. How many votes are there?
8
4
A graph has three rows with 5, 2 and 7 pictures. Which row is the longest?
The row with 7 pictures.