Here is a quick picture of our class's favourite pets, up on the board. Hands up: just by looking at it, which pet's bar is the tallest?

A picture like this makes the winner easy to see at a glance. Today we learn how to build one of these ourselves, so that the tallest bar always shows the most.

Now let's meet a second set of data, this time our class's favourite fruit. Look at these four bars on the block graph, a picture where each answer has a bar and the taller the bar, the more chose it. Each square up the side counts as one, so the top of each bar lands exactly on a number. Look at where each bar's top sits, and notice the empty bar that reaches zero.

Now you set the fruit bars we just watched. We build our class fruit graph together on the board. Set the apple bar to 5. Then set the banana bar to 8. Then set the orange bar to 3. Finally, leave the pear bar empty at 0. Before each bar, say where its top should land.

Here is a new set of data, this time about favourite colours. We build four bars in turn, each one taller than the last. First set a bar for 3. Then set a bar for 6. Then set a bar for 8. Finally set a bar for 10, and remember to keep counting single squares. Before each one, point to the line where its top must land, then check.