3
Flower pictures into a bar graph
Discover Mathematics P2: Term 1, Lessons 2–10
GoalRead a pictograph with a key and turn it into a bar graph.
New words
pictograph · a graph that uses small pictureskey · it tells what one picture meansbar graph · a graph that uses bars
Explanation
A pictograph uses pictures instead of bars. Look at the key to see what one picture means. Here one flower picture means 1 flower. To turn a pictograph into a bar graph, give each day one bar. The bar is as tall as the number of pictures. Add a title, a name for the side numbers, and a name under each bar.
Worked examples
On Tuesday there are 5 flower pictures, so 5 flowers were picked. Thursday has only 1 picture, so it has the fewest.
The bar graph has a bar for each day with the same heights: 4, 2, 5, 3 and 1.
In this pictograph one picture means 2 flowers. Sunday has 3 pictures: 2, 4, 6. So 6 flowers were picked on Sunday.
Class activity
Make a pictograph at home. Count the shoes by the door for each person and draw one small shoe picture for each pair. Write a key. Then turn it into a bar graph on squared paper.
Practice
1
Youssef sells oranges. Each picture means 2 oranges. How many oranges did he sell on Wednesday?
10 (5 pictures: 2, 4, 6, 8, 10)
2
How many oranges did he sell on Tuesday?
4
3
How many more oranges did he sell on Wednesday than on Tuesday?
6 (10 − 4 = 6)
4
How many oranges did he sell in all four days?
28 (6 + 4 + 10 + 8 = 28)
5
You turn this pictograph into a bar graph. How tall is the Thursday bar?
8