Reading bar charts LO: to solve a problem by organising and interpreting data in bar charts with intervals in ones and twos.
Look at the way a bar chart is constructed. Can you name its different parts? What goes here? What is this called? What is this? What do we call this?
A bar chart always has a title. Vertical axis (y). Always labelled and numbered. The height of the bars show how many of something was scored/recorded. Horizontal axis (x). Always labelled.
8 7 6 5 4 3 2 1 What does this bar chart show? How many children were surveyed? Which is the favourite flavour? Which is the least liked? What intervals are used on the y axis? What intervals could you use if twice as many children were surveyed? Can you read the answers? Favourite Crisps Number of children 0 Salt and vinegar Cheese and onion Prawn cocktail Ready salted Bacon Worcester sauce Barbeque Flavours
How can you collect the information needed to construct a bar chart? By making a tally chart first!
Flavour Tally Insert any other flavours here
Tables 1 and 2: • Working in table groups, survey all the children on your tables using the tally chart template. Find out THEIR favourite crisps. • Then working in pairs, construct a bar chart showing the favourite crisps in our class. With support
Tables 3 and 4: • Working in threes, shuffle and then deal 30 Pokémon cards. Sort into card types. • Fill in the tally chart and draw a bar chart showing card types in a typical deal.
Pokémon card tally sheet Card type Tally
Table 5: • Working in pairs, deal out 25 Jackie Chan cards and sort them into different types. • Fill in the tally chart and create a bar chart to show card types in a typical deal.
Jackie Chan Tally Sheet Card type Tally