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How can we compare data?

Tables, pictograms and bar charts are a great way to compare and ask questions about results.

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Tables

Tables use numbers. This table shows you the amount of flowers that were planted in a garden.

a table showing the amount of flowers planted

By looking at the table, you can easily compare the numbers.

Let's use the table to answer some questions.

questions

Which flower was planted the most?

For this question, you look for the largest value in the column titled 'Amount planted' .

You can see that the pansy was planted the most.

How many more roses were planted than daffodils?

This question is asking you to find the difference between the two results.

Look at the table again. You need to subtract the number of daffodils (67) from the number of roses (89).

89 鈥 67 = 22

So there were 22 more roses planted than daffodils.

questions
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Watch: Using a table to record data

Watch the video below to see a data table being used to record the scores at a mini golf game.

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Pictograms

A pictogram uses pictures or symbols to represent data.

Number of points collected by each group in the class
a pictogram showing the amount of points collected by each group

The key shows that one whole circle represents 100 points. This helps you to work out how many points were awarded to each team.

A semi-circle must represent 50 points since it鈥檚 half of the whole, and a quarter-circle must show 25 points.

questions

How many more points did Sapphire win than Ruby?

This is another subtraction question. Sapphire was awarded 350 points and Ruby have 325 points.

350 - 325 = 25 points

So Sapphire was awarded 25 points more than Ruby.

How many points did Diamond and Emerald get altogether?

The word 鈥渁ltogether鈥 means addition. Both houses have 250 points.

250 + 250 = 500 points

So Diamond and Emerald got 500 points altogether

questions
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Bar charts

A bar chart is another visual way to represent data. The heights of the bars let you automatically see the difference in results.

Class 4's favourite sports
a bar chart showing the children's favourite sports
questions

Using the bar chart above, you can quickly see that football was the most popular sport and tennis was the least popular.

questions
questions

Which two sports had a difference of 4 children?

Work out how many children chose each sport and then find the two numbers with a difference of 4.

9 - 5 = 4

Rugby and swimming had a difference of 4 children.

How many children were asked about their favourite sport altogether?

For this question, add up all the results.

3 + 9 + 14 + 5 + 8 = 39

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Activities

Quiz

Try this quiz on comparing data.

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Activity 2

Illustration of a hand drawing a bar chart

Compare data by making your own bar chart.

What items do you have in your home that you could compare?

For example, how many tables, lamps, doors or windows do you have?

Choose categories, count the items and draw your bar chart.

Illustration of a hand drawing a bar chart
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NEW! Play Guardians: Defenders of Mathematica - the Halloween update
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More on Tables, graphs and charts

Find out more by working through a topic