Calculate the difference when information is presented in a bar chart | Maths

Starter quiz

What is the height of Andeep’s sunflower? The sunflower is ______ cm tall.

7

8 ✓

9
How long is the snake? The snake is ______ cm long.

'6' ✓
Which of these bars is 12 cm?

Red

Purple ✓

Yellow
Which of these bars measures 17 cm?

Red

Purple

Yellow ✓
What number is missing from this number line?

'15' ✓
What number is missing from this number line?

'19' ✓

Izzy, Sam, Alex and Lucas play a game. They make a bar chart of points scored. How many points did Alex score?

'7' ✓
How many more points did Sam score than Izzy?

'6' ✓
Which two children had a difference of 4 points?

Alex and Sam

Izzy and Sam

Izzy and Lucas ✓

Alex and Lucas
Laura, Sofia, Jun and Andeep play a game. They record their points in a table and plan to draw a bar chart. Using the table below, state how many points Andeep scored.

'13' ✓
Look at the table. How many fewer points did Laura score than Jun?

'10' ✓
Look at the table. Which two children had a difference of 2 points?

Sofia and Jun ✓

Laura and Sofia

Laura and Jun

Andeep and Jun

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A bar chart is a graph that uses bars to represent information.
Bar charts can have different scales.
The difference is one of the parts that make the whole. Whole - part = part (difference)
You can calculate the difference by counting on from the known part to the whole.

Children may initially struggle to read and interpret the data on the bar chart / graph.

A ruler can be used to help children line up the top of the bar with the scale. Model this as a strategy to support accurate reading.

Bar chart - A graph that uses bars of different heights to represent information.
Difference - The result of subtracting one number from another. Way in which two or more things we are comparing are not the same.
Counting on - A mental strategy used to add numbers.
Subtraction - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.