The table shows the number of children who have each colour as their favourite. The number that is next to each colour in the table will be the number of blocks that are shaded in in each column of the block graph. We can see that both green and red have 5 blocks shaded in and are the same height. Because zero people prefer the colour purple, no blocks are drawn in this column.
Example Video Questions Lesson. A block graph also known as a block diagram is a simple way to present data with coloured squares. Download PDF. Block diagrams are also known as block graphs. Block diagrams are one of the first methods for presenting data that a child will see in school. Block diagrams are often introduced before teaching bar charts in key stage 1 or first grade.
A block graph is drawn on square grid paper. In a block graph the different categories are listed along the bottom of the graph below each square on the grid. The number of blocks in each category tell us how many of each category there are. A block graph looks similar to a bar chart but it is different in a couple of ways. A block graph does not have spaces in between each category like a bar chart does.
Each shaded block on a block graph is always worth one, whereas on a bar chart this is not the case. On a bar chart, each block value depends on the scale of the chart. On a bar chart the blocks are not separate and instead form one solid bar. Sometimes, a block graph may contain images of items rather than a shaded in square, almost like a pictogram.
However, in this lesson, as is the case usually, each block will be shaded in. Here is our first example of using a block diagram. In this example we will draw a block graph to show the number of each colour counter.
We start by writing the names of the colours below each square on the bottom of the block diagram. Each counter is worth one block. We can take away each counter as we count it so that we do not count it twice. As we pick up and count each counter, another block is shaded in. Each block is worth one counter. When teaching block graphs, it can be helpful to use different colours for each category. In this example we are using the same colour blocks as counters.
To read a block diagram, read the number which is in line with the top of each set of blocks. It may be helpful to use a ruler. You can line the ruler up with the top of the block and read across it to see the number.
In this example, we have a table showing the favourite colours of children in a class. We will use this table to draw a block graph.
The number of children that prefer each colour is written next to the colour in the table. The number next to each colour is the number of blocks that need drawing. In this example, we are given a block graph and will use it to complete the table. This block graph shows the number of pets owned by children in a class. The mouse column contains 2 blocks.
The top of the block is in line with a 2. This means that there are 2 mice owned by children in this class. There are 4 blocks in the cat column of the block diagram. Year 3: Answer a question by collecting, organising and interpreting data; use tally charts, frequency tables, pictograms and bar charts to represent results and illustrate observations; use ICT to create a simple bar chart. Year 4: Answer a question by identifying what data to collect; organise, present, analyse and interpret the data in tables, diagrams, tally charts, pictograms and bar charts, using ICT where appropriate.
Year 5: Interpret a reading that lies between two unnumbered divisions on a scale. Year 6: Construct and interpret frequency tables, bar charts with grouped discrete data, and line graphs; interpret pie charts.
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