New
New
Year 1
Solve problems using a bar model to represent a whole partitioned into two parts
I can solve problems using a bar model to partition a number into two parts.
New
New
Year 1
Solve problems using a bar model to represent a whole partitioned into two parts
I can solve problems using a bar model to partition a number into two parts.
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Lesson details
Key learning points
- Partitioning of numbers to five can be represented using the bar model.
- The bar model and the part-part-whole diagram can be used to represent stories.
- Systematic thinking can be used to ensure all possible responses to a problem can be found.
Keywords
Partition - Partition is to split a whole up into parts.
Combine - Combine means 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 whole and the parts.
Common misconception
As before, children may confuse the whole and the parts, or add them all up to find the total.
Place objects in each part of the bar model and combine them to make the whole, or starting within the whole, partition them into the parts.
Play partitioning games and represent using bar models. Use squared paper to encourage children to draw their own bar models, placing counters, cubes or dots in each part to begin with to help them get a sense of the size of the parts.
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.
Which one of these is showing a bar model?
Q2.
What is the missing part?
2
3
Q3.
Which bar model is showing Sofia’s counters correctly partitioned?
Q4.
Jun has 3 cubes and Sofia has 1 cube. Which bar model is showing their cubes combined?
Q5.
Jun has 2 counters and Sofia has 1 counter. Which bar model is showing their counters combined?
Q6.
Jun is working systematically to find all the ways to partition 3 counters. What does systematically mean?
Partitioning the counters in any order.
Exit quiz
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6 Questions
Q1.
Jun and Sofia have thrown 5 counters. Which bar model is showing their counters?
Q2.
Jun and Sofia have thrown 4 counters. Which bar model is showing their counters?
Q3.
How many more fingers does Sofia need to show?
2
5
Q4.
How many more fingers does Jun need to show?
3
4
Q5.
Which set of counters will come next if we are working systematically?
Q6.
Which bar model represents the next set of counters if we are working systematically?
Additional material
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