New
New
Year 1
Use a bar model to represent a whole partitioned into two parts
I can use a bar model to represent the different ways of partitioning a number into two parts.
New
New
Year 1
Use a bar model to represent a whole partitioned into two parts
I can use a bar model to represent the different ways of partitioning a number into two parts.
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Lesson details
Key learning points
- Partitioning can be represented using the bar model.
- There are ___ objects. ___ is the whole.
- There are ___ and ___. ___ is a part. ___ is a part.
- Combine the bars to form the full bar model, and compare this with the part-part-whole model.
Keywords
Partition - To split a whole up into parts.
Combine - To put parts together to make a whole.
Bar model - A bar model is a pictorial representation of a problem where bars are used to represent the known and unknown quantities.
Common misconception
Children may not see the bar model as proportional, so may think that the parts are equal.
Encourage children to see that the bars are proportional to help them get a sense of the size of the parts and whole.
Encourage children to put small objects in the parts and move them into the whole as with the part-part-whole model. Children can use squared paper to help draw the bars, but it is not crucial the bars are accurate at this stage.
Teacher tip
Licence
This content is © Oak National Academy Limited (2025), licensed on
Open Government Licence version 3.0
except where otherwise stated. See Oak's terms & conditions (Collection 2).Lesson video
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Starter quiz
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6 Questions
Q1.
Is 5 the whole or a part?
A part
Q2.
What is the whole?
2
3
Q3.
What is the missing part?
3
4
Q4.
What is the missing part?
1
3
5
Q5.
Which part-part-whole model is showing Jacob’s cubes correctly partitioned?
Q6.
Which part-part-whole model is showing the birds correctly partitioned?
Exit quiz
Download exit quiz
6 Questions
Q1.
Match each word to its definition.
to split a whole up into parts.
to put the parts together to make the whole.
Q2.
Which bar model is showing these cubes partitioned correctly?
Q3.
Which bar model matches the part-part-whole model?
Q4.
Jacob has 2 cubes and Izzy has 1 cube. Which bar model is correctly showing their cubes?
Q5.
Jacob thinks the missing part will be the same for all of these. Is he correct?
Yes
Q6.
Izzy thinks the missing part will be the same for all of these. Is she correct?
No