3
Graphs and odd one out
Discover Mathematics: Chapter 7
GoalRead picture graphs and bar graphs, and find the odd one out in a set.
New words
graph · a picture that shows countspicture graph · one picture for each answerbar graph · a row of squares for each answerodd one out · the one that does not belong
Explanation
A picture graph shows answers with pictures. Each row is one kind of answer. Count the pictures in a row to find how many. The row with the most pictures is the favourite. A bar graph is the same, but it uses squares. To find the odd one out, look at a set and ask which one does not belong. A cat, a dog and an apple: the apple is the odd one out, because it is not an animal.
Worked examples
Mina asks her friends about their favourite fruit. 5 chose banana, 3 chose orange and 4 chose apple. Banana has the longest row, so banana is the favourite.
Another graph uses squares. 6 children chose red and 3 chose blue. 6 − 3 = 3, so 3 more children chose red.
A rose, a tulip and a shoe: the shoe is the odd one out, because it is not a flower.
Class activity
Make a graph. Ask 10 people at home or in the street which they like best, tea or juice. Let the child draw one square for each answer in two rows. Count each row and say which one most people like.
Practice
1
Look at the pet graph. How many fish are there? Which pet has the fewest? How many more fish than birds are there?
5 fish. The bird has the fewest. There are 3 more fish than birds.
2
Which is the odd one out?
The banana, because it is not a vehicle.
3
In a picture graph, which row shows what most children like best?
The longest row
4
In the squares graph, how many children chose in all?
9