New
New
Year 2

Calculate the difference when information is presented in a bar chart

I can calculate the difference when information is presented in a bar chart.

New
New
Year 2

Calculate the difference when information is presented in a bar chart

I can calculate the difference when information is presented in a bar chart.

Lesson details

Key learning points

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

Common misconception

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.

Keywords

  • 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.

Encourage children to make their own enquiries about the bar charts / graphs within this lesson. What do you notice? What can you tell me about __________? What is the same? What is different?
Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).

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6 Questions

Q1.
What is the height of Andeep’s sunflower? The sunflower is cm tall.
An image in a quiz
7
Correct answer: 8
9
Q2.
How long is the snake? The snake is cm long.
An image in a quiz
Correct Answer: 6, 6cm, 6 cm
Q3.
Which of these bars is 12 cm?
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Red
Correct answer: Purple
Yellow
Q4.
Which of these bars measures 17 cm?
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Red
Purple
Correct answer: Yellow
Q5.
What number is missing from this number line?
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Correct Answer: 15, fifteen
Q6.
What number is missing from this number line?
An image in a quiz
Correct Answer: 19, nineteen

6 Questions

Q1.
Izzy, Sam, Alex and Lucas play a game. They make a bar chart of points scored. How many points did Alex score?
An image in a quiz
Correct Answer: 7, seven
Q2.
How many more points did Sam score than Izzy?
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Correct Answer: 6, six
Q3.
Which two children had a difference of 4 points?
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Alex and Sam
Izzy and Sam
Correct answer: Izzy and Lucas
Alex and Lucas
Q4.
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.
An image in a quiz
Correct Answer: 13, thirteen
Q5.
Look at the table. How many fewer points did Laura score than Jun?
An image in a quiz
Correct Answer: 10, ten
Q6.
Look at the table. Which two children had a difference of 2 points?
An image in a quiz
Correct answer: Sofia and Jun
Laura and Sofia
Laura and Jun
Andeep and Jun