Comparing data | Year 4 Mathematics PDF Download

How can we compare data?

Tables, pictograms, and bar charts are effective tools to compare and analyze data.

Tables

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

By looking at the table, you can easily compare the numbers.
Let's use the table to answer some questions:

(i) Which flower was planted the most?
Ans: 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.

(ii) How many more roses were planted than daffodils?
Ans: 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 – 67 = 22
So there were 22 more roses planted than daffodils.

Pictograms

A pictogram uses pictures or symbols to represent data.
Number of points collected by each group in the class

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’s half of the whole, and a quarter-circle must show 25 points.

(i) How many more points did Sapphire win than Ruby?
Ans: 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.

(ii) How many points did Diamond and Emerald get altogether?
Ans: The word “altogether” means addition. Both houses have 250 points.
250 + 250 = 500 points
So Diamond and Emerald got 500 points altogether

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

(i) Which two sports had a difference of 4 children?
Ans: 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.

(ii) How many children were asked about their favourite sport altogether?
Ans: For this question, add up all the results.
3 + 9 + 14 + 5 + 8 = 39